Two hundred and twenty-two people between 19 and 38, all of whom would pass a hearing test. Both ears each, so 444 ears, measured at frequencies a standard audiogram never reaches.
Forty-two of them had hearing loss.
Seven knew.
That’s the finding, and I went into this research expecting a different one. I was looking for how much damage eight hours a day of headphones does over a working life. The same study that turned up those forty-two people also compared routine earphone users against non-users, on three separate measures, and found no difference on any of them.
The one in five
The study measured hearing thresholds at standard frequencies and at extended high frequencies — 10, 12.5, 14 and 16 kHz — plus speech recognition in multi-talker babble, in both ears of every participant. All had normal audiograms, meaning 20 dB HL or better across the range a clinic tests (Mishra, Saxena and Rodrigo, Ear & Hearing 2022, DOI: 10.1097/AUD.0000000000001140).
Forty-two of the 222 had impairment above 8 kHz. Only seven of those had any case history or complaint about listening in noise. The other thirty-five were walking around with measurable hearing loss, no symptoms they’d noticed, and a clean audiogram if anyone had checked.
A standard hearing test stops at 8 kHz. Every one of those forty-two would pass one.
It isn’t cosmetic. In the study’s models, extended high-frequency impairment affected speech-in-noise recognition independently of age and independently of hearing at speech frequencies — three separate effects, each significant on its own. The people with it also had fewer measurable otoacoustic emissions, and lower ones when present, which the authors suggest may indicate preclinical cochlear degeneration.
Speech-in-noise recognition is not an abstraction for this readership. It’s the open-plan office. It’s the conference line where two people talk at once. It’s the third hour of calls when you stop catching things the first time.
Where it comes from, and it isn’t your AirPods
The same paper compared earphone users against non-users. No difference in hearing thresholds. No difference in speech-in-noise recognition. No difference in otoacoustic emissions.
Three measures, 444 ears, the right age band, and a comparison with every opportunity to find something. It found nothing.
That’s a null worth taking at face value rather than explaining away. Adequate sample, correct population, appropriate instruments — when a study is built well enough to detect an effect and reports none, the null is the answer.
What the study did point at is age, arriving far earlier than anyone expects. The authors found a breakpoint in the threshold-age function for males but not females, and concluded that age-related deterioration in auditory function is observable in the third decade of human life, with rapid processes operating from around 21.
Twenty-one. The thing eating your high frequencies started when you were in university, and it isn’t a habit you can change.
Why every headline says otherwise
Because most of the alarming numbers come from asking people, and the studies that measured found something else.
The widely repeated claim that a billion young people are at risk traces to a 2022 meta-analysis of 33 studies and 19,046 individuals. It pooled the prevalence of unsafe listening from personal devices at 23.81%, applied that to the global population aged 12–34, and produced the 0.67-to-1.35-billion figure that went everywhere (Dillard et al., BMJ Global Health 7(11):e010501). The authors state plainly that they cannot say how many of those people will actually develop hearing loss, and flag the lack of standardised methodology across the studies they pooled.
That number comes from questionnaires.
A Dutch group instead put an app on the phones of 314 adolescents and measured actual daily dose. 2.2% exceeded the recommended daily limit across all days the app ran, and 9.9% counting only the days they listened. Their conclusion was that the majority exhibited listening habits that could be considered safe (Paping et al., Otolaryngol Head Neck Surg 2022).
Twenty-four per cent when you ask. Two per cent when you measure.
Two caveats travel with that comparison: the objective study used the 85 dBA occupational threshold rather than the WHO’s 80 dB consumer figure, and its participants were thirteen-year-olds rather than adults on all-day calls. It doesn’t prove you’re fine. It shows that the self-report literature and the measured literature disagree by an order of magnitude, and that the frightening one is the one that got reported.
The systematic reviews land in the same place. A 2024 review searched five databases, included 20 studies, and concluded that while some recreational noise activities are potentially harmful, the relationship between exposure and outcome is unclear, with most observed changes short-term and confined to the extended high frequencies (Elmazoska et al., J Speech Lang Hear Res 67(2):688–710; funded by a Swedish research council, no competing interests declared). A 2025 meta-analysis of 30 studies and roughly 2,500 normal-audiogram adults did find poorer thresholds above 8 kHz in noise-exposed groups — but reported the association was more pronounced for occupational than recreational exposure (Aryal et al., Trends in Hearing 29:23312165251343757; no conflicts, no funding).
The arithmetic that’s still worth knowing
None of the above makes the exposure numbers irrelevant. It changes what they are: not a prediction of harm, but a boundary past which nobody is making promises. Worth respecting mainly because respecting it costs nothing.
The WHO reference exposure for adults is 80 decibels for 40 hours a week. Eight hours a day, five days a week, is forty hours. At 80 dB — which WHO likens to a doorbell — the working day alone is the entire weekly allowance, and the commute and the gym are overdraft.
Then there’s the exchange rate, which almost nobody has internalised. Sound energy doubles every 3 dB, so permitted time collapses much faster than the numbers suggest:
80 dB — 40 hours. 85 dB — 12 hours 30. 90 dB — 4 hours. 95 dB — 1 hour 15. 100 dB — 20 minutes.
Five decibels — the nudge you give the volume when someone joins the call from a café — costs twenty-seven and a half hours of allowance.
One correction while we’re here. The 85 dB figure you’ve absorbed as “the safe level” is an occupational limit, written for paid workers in workplaces, and NIOSH — which set it — states explicitly that its limits are not a recommendation for exposures outside work. WHO’s consumer figure is 80. If you’ve been treating 85 as your ceiling, you’ve been using a number designed for someone with hearing protection, employer liability cover and an annual audiogram.
That’s a familiar shape: a real number, correctly derived, quietly transplanted onto a population it was never about.
The cognition question, since you’ve seen the headlines
Hearing loss gets described as a major modifiable risk factor for cognitive decline, and the observational association is large — population studies cited in the trial literature put it at a 94% increased risk of incident dementia.
Then someone randomised it. ACHIEVE enrolled 977 cognitively normal adults aged 70–84 with untreated hearing loss, half to a best-practices hearing intervention and half to health education, over three years. No overall effect on cognition (Lin et al., Lancet 2023, DOI: 10.1016/S0140-6736(23)01406-X). A subgroup at higher dementia risk showed a large benefit; the primary outcome did not move.
The disclosures deserve a line because they point the wrong way for the result. The first author reports consulting fees from Frequency Therapeutics and Apple, and the hearing technologies used in the trial were donated to Johns Hopkins by Sonova/Phonak, the manufacturer. Funding came from the National Institute on Aging, which had no role in design, analysis or the decision to publish. A trial equipped by the device maker, reporting a null.
That’s a question about 2065 anyway. The present-tense version is the finding at the top of this article: high-frequency hearing you can’t detect with a standard test measurably costs you speech recognition in noise, and that’s Thursday afternoon rather than retirement.
What’s genuinely unsettled
Whether personal listening devices cause measurable damage in ordinary use. The best-matched study says no; smaller cross-sectional studies using electrophysiological markers say maybe; the systematic reviews say the methods are too inconsistent to tell. A longitudinal study following listeners from adolescence into adulthood was published this month and I haven’t read it — if it contradicts the above, this article is what needs updating.
Whether the subclinical markers predict anything. A 2026 narrative review on extended high-frequency audiometry concluded it may hold promise as an early indicator, but that normative data, objective exposure monitoring and longitudinal research are all still needed, and that it is not in routine clinical practice. Elevated thresholds above 8 kHz are a research finding, not a diagnosis. Don’t finish this article convinced you have hearing damage — thirty-five of those forty-two people had no symptoms, and symptoms aren’t the test.
What isn’t unsettled: the damage, when it happens, is permanent. WHO’s account is that sensory cells fatigue with exposure, producing temporary muffled hearing or ringing that usually recovers — but with regular exposure to loud or prolonged noise, those cells and the surrounding structures become permanently damaged, producing irreversible hearing loss, tinnitus, or both, usually gradually and usually unnoticed until it isn’t.
And one countervailing point most coverage skips: headphones in a noisy office aren’t only an exposure, they’re a tool. Speech-like background noise measurably costs working memory during comprehension. Taking them off may trade one cost for another. Lower and better-isolated beats less.
Four things, none of which cost anything
The evidence doesn’t support alarm about your headphones. It does support four moves that are free, and free is a low bar to clear.
Look at the number you already have. iPhone: Health → Browse → Hearing → Headphone Audio Levels, with a week of history in decibels. Android 14 and later track sound dose in the audio framework per IEC 62368-1, warning at each 100% of the computed limit and lowering the volume if you don’t acknowledge it, though implementation varies by manufacturer. Thirty seconds, and it’s your number instead of a general warning.
Cap it at 60%. WHO’s first recommendation for device volume is no more than 60% of maximum, or below an 80 dB average if you’re monitoring. iOS: Settings → Sounds & Haptics → Headphone Safety → Reduce Loud Audio.
Buy noise cancellation for the reason WHO gives. Not because it protects your ears directly — nobody has run that trial — but because WHO recommends well-fitted noise-cancelling headphones specifically to reduce the need to raise volume in noisy situations. That’s the café nudge eliminated at the source, and given the exchange rate it’s the highest-leverage purchase in the category.
Take call breaks somewhere quiet. WHO publishes advice aimed at exactly the person reading this — someone who works virtually and spends hours on headphones — and this is on it, alongside limiting noise exposure off the clock.
What I’d skip: asking for extended high-frequency testing. It’s the obvious response to the finding at the top of this article, and it mostly isn’t available — the 2026 review says plainly that it isn’t in routine clinical practice, so most audiology clinics won’t offer it and won’t have normative data to interpret it against if they do. Worth asking about if you’re already seeing someone for your hearing. Not worth booking an appointment for.
The takeaway isn’t that your headphones are hurting you. The best study of your exact demographic says they aren’t, and the studies that measured rather than asked found a tenth of the risk the headlines report.
It’s that one in five people your age already has hearing loss nobody tests for, six in seven of them haven’t noticed, and it starts around 21 from something you can’t turn down.
About this article
Written by Drew Anton. Drew covers sleep, timing, environment and the devices in between. Not a physician or research scientist — reads the primary literature closely and refuses to round up.
Medical review: None. NeuriFuel does not currently have a licensed clinician on the editorial team, and this article has not been medically reviewed. We state this rather than implying an authority we do not have. See our About page for our full methodology.
Sources: Thirteen, comprising one cross-sectional study of 444 ears, one objective-dosimetry cohort study, one randomised controlled trial, three systematic reviews or meta-analyses, one narrative review, one small electrophysiological study, two sets of official World Health Organization guidance, one analysis of how noise exposure guidelines are derived, and two pieces of manufacturer technical documentation. Funding and conflicts were retrievable for four studies and are stated inline, including for the trial whose disclosures point against its own result; for the remainder they were not available in the sources I could reach, and I have marked that absence rather than assume it was clean. One directly relevant longitudinal study published this month has not been read and is identified as such in the text.
Corrections: Found an error? Write to hello@neurifuel.com with a source and we will fix it and log the correction.
Last updated: 1 August 2026
References
- Mishra SK, Saxena U, Rodrigo H (2022). Extended High-frequency Hearing Impairment Despite a Normal Audiogram: Relation to Early Aging, Speech-in-noise Perception, Cochlear Function, and Routine Earphone Use. Ear & Hearing 43(3):822–835. DOI: 10.1097/AUD.0000000000001140. PMID: 34700326.
- World Health Organization. Deafness and hearing loss: Safe listening. Questions and answers, updated 6 March 2026. Source of the weekly exposure table, the 60% recommendation, the noise-cancelling guidance, and the account of temporary versus permanent damage.
- World Health Organization and International Telecommunication Union (2019). Safe listening devices and systems: a WHO-ITU standard. Reference exposure of 80 dB for 40 hours per week for adults.
- Dillard LK, Arunda MO, Lopez-Perez L, Martinez RX, Jiménez L, Chadha S (2022). Prevalence and global estimates of unsafe listening practices in adolescents and young adults: a systematic review and meta-analysis. BMJ Global Health 7(11):e010501. DOI: 10.1136/bmjgh-2022-010501.
- Paping DE, Vroegop JL, Geleijnse G, le Clercq CMP, Koenraads SPC, van der Schroeff MP (2022). Objective Measurement of Listening Device Use and Its Relation to Hearing Acuity. Otolaryngology–Head and Neck Surgery. DOI: 10.1177/01945998211012274.
- Elmazoska I, Mäki-Torkko E, Granberg S, Widén S (2024). Associations Between Recreational Noise Exposure and Hearing Function in Adolescents and Young Adults: A Systematic Review. Journal of Speech, Language, and Hearing Research 67(2):688–710. DOI: 10.1044/2023_JSLHR-23-00397. Funded by the Swedish Research Council for Health, Working Life and Welfare; authors declared no competing interests.
- Aryal S, Trevino M, Rodrigo H, Mishra S (2025). Is Noise Exposure Associated With Impaired Extended High Frequency Hearing Despite a Normal Audiogram? A Systematic Review and Meta-Analysis. Trends in Hearing 29:23312165251343757. DOI: 10.1177/23312165251343757. Authors declared no conflicts and received no financial support.
- Jiang W, Zhao F, Guderley N, Manchaiah V (2016). Daily music exposure dose and hearing problems using personal listening devices in adolescents and young adults: A systematic review. International Journal of Audiology 55(4):197–205. DOI: 10.3109/14992027.2015.1122237.
- Lin FR, Pike JR, Albert MS et al. (2023). Hearing intervention versus health education control to reduce cognitive decline in older adults with hearing loss in the USA (ACHIEVE): a multicentre, randomised controlled trial. The Lancet 402:786–797. DOI: 10.1016/S0140-6736(23)01406-X. Funded by the National Institute on Aging (R01AG055426, R01AG060502). Disclosures stated inline in the text.
- Škerková M, Mrázková E, Kovalová M, Kocurková L, Gottfriedová N (2026). Extended high-frequency audiometry for detecting early hearing effects of personal listening devices: A narrative review. European Annals of Otorhinolaryngology, Head and Neck Diseases 143(3):195–200. Funded by university research grant SGS09/LF/2023.
- Electrophysiological Evidence of Early Auditory Dysfunction in Personal Listening Device Users: Insights from ABR with Ipsilateral Masking (2025). Diagnostics 15(21):2672. DOI: 10.3390/diagnostics15212672.
- Why Are Noise Exposure Guidelines So Complex? PMC10194210. Source for the derivation and protective assumptions behind the WHO, EPA and NIOSH limits, and for the 3 dB exchange rate.
- Apple Support, Headphone notifications and Headphone Audio Levels; Android Open Source Project, Sound dose. Manufacturer technical documentation.