Hearing starts fading in your 20s, from the highest pitches down. See the frequency you should hear at your age, why ear cells never regrow, and how to slow it.
Published October 20, 2026
We lose our hearing as we age because the hair cells in the inner ear, and the nerve fibers wired to them, wear out and never grow back. The first to go sit at the entrance of the cochlea, where the highest pitches are picked up, so hearing fades from the top down, often starting in your 20s. Doctors call it presbycusis. A lifetime of loud noise speeds it up, and so do genes, smoking, diabetes and some medicines.
It is the most common sensory loss there is. According to the World Health Organization, more than 25% of people over 60 live with disabling hearing loss, and nearly 2.5 billion people will have some degree of hearing loss by 2050. In the United States, the National Institute on Deafness and Other Communication Disorders (NIDCD) counts about one in three people aged 65 to 74 with hearing loss, and nearly half of those over 75 have difficulty hearing.
Find the highest frequency you can still hear, and the hearing age it matches, in about a minute.
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A young ear covers roughly 20 Hz to 20,000 Hz. The top of that range shrinks with every decade, by about 1,000 Hz every five years on the curve below. Speech sits mostly below 8,000 Hz, which is why the early years of the decline go unnoticed.
This is the indicative curve the HumanRank hearing test maps your result onto, rounded. Treat it as a rule of thumb: two people of the same age can sit far apart on it, and years of loud noise can give a 30-year-old the high-frequency hearing of a 50-year-old.
The Mosquito shows how sharp the cutoff is. Howard Stapleton built the anti-loitering alarm in Wales in 2005 to keep teenagers from gathering outside shops: its 17.4 kHz tone is loud to most people under 25 and silent to most adults. It won the Ig Nobel Peace Prize in 2006, and students soon turned the same tone into a ringtone their teachers could not hear.
The cochlea is a fluid-filled tube coiled like a snail shell. Sound enters at its base and travels toward its tip, and each spot along the way answers to one pitch: the base to the highest frequencies, the tip to the lowest. Every sound you hear, low or high, sweeps past the base first, so the cells there take wear from everything.
For 60 years, textbooks blamed age-related hearing loss mostly on the stria vascularis, the tissue that works as the cochlea's battery. In 2020, a team led by M. Charles Liberman at Harvard and Mass Eye and Ear examined 120 human inner ears donated at autopsy and found the opposite: hair cell loss predicted how much hearing people had lost, and the state of the battery did not. Ears with a history of loud noise had lost far more hair cells, especially in the high-frequency half of the cochlea. The authors' conclusion, published in The Journal of Neuroscience: a lifetime of acoustic overexposure is to blame.
An eye has more than 100 million light-sensing cells. An ear has fewer than 16,000 hair cells: one row of about 3,500 inner hair cells, which send sound to the brain, and three rows of about 12,000 outer hair cells, which amplify quiet sounds. Outer hair cells are the more fragile of the two, and they are usually the first to die from noise and age.
Birds and fish regrow lost hair cells. Adult mammals cannot. Every hair cell you will ever use was in place before you were born, so each one lost to noise, a drug or age is gone for good, and the damage adds up over a lifetime.
In 2009, Sharon Kujawa and M. Charles Liberman exposed mice to noise at 100 dB for two hours, about the level of a loud concert. Their hearing dulled and then fully recovered within two weeks, and no hair cells died. Yet up to half of the synapses linking inner hair cells to the auditory nerve were gone for good. A normal hearing test could not see it, so the team called it hidden hearing loss.
The same thing happens in aging human ears. In a 2019 study of 20 human cochleas in the journal Neuroscience, Liberman's lab found that inner hair cell loss rarely topped 15% at any age, while 7 of the 11 people over 60 had lost more than 60% of their nerve fibers. Researchers still debate how much this explains in living people, but it fits a familiar complaint: a normal hearing test, and conversations that fall apart in a noisy restaurant.
The US National Institute for Occupational Safety and Health (NIOSH) sets the safe limit at 85 dB for 8 hours a day. Every 3 dB above that doubles the sound energy, so the safe time is cut in half.
Safe times from the NIOSH limit of 85 dB for 8 hours, with the time halved for every 3 dB. For headphones, the WHO and the International Telecommunication Union set a weekly budget instead: 80 dB for 40 hours a week for adults, 75 dB for children.
That is why the WHO estimates that more than 1 billion young adults are at risk of permanent, avoidable hearing loss from unsafe listening. The damage does not hurt, and the ringing after a loud night usually fades by morning. The lost synapses do not come back.
Treatment is the step most people skip. According to the NIDCD, fewer than one in three adults over 70 who could benefit from hearing aids has ever used them. In the United States, hearing aids have been sold over the counter for adults with mild to moderate hearing loss since October 2022.
In 2024, the Lancet Commission on dementia listed hearing loss as one of 14 modifiable risk factors and estimated that it accounts for about 7% of dementia cases, tied with high LDL cholesterol for the largest share. The link does not prove that hearing loss causes dementia. One idea is that a brain straining to decode muffled sound has fewer resources left for memory and thinking.
Treatment may help some people. In the ACHIEVE trial, published in The Lancet in 2023, hearing aids did not slow cognitive decline over three years across all 977 older adults. In a group of 238 participants at higher risk of decline, though, cognitive decline was 48% slower with hearing aids.
Not yet for age-related hearing loss. Hearing aids make sound louder for the hair cells that remain, and cochlear implants skip them and stimulate the nerve directly, but nothing regrows hair cells in a human ear today.
Gene therapy is the first real crack in that wall. In a trial published in The Lancet in January 2024, 5 of 6 children born deaf because of a faulty OTOF gene gained hearing after a single injection into the inner ear. That only works for one rare inherited form of deafness, but it shows that the inner ear can be repaired.
The HumanRank hearing test plays a tone that sweeps down from 22,000 Hz to 4,000 Hz over 60 seconds. You click the moment you hear it, and the test turns that frequency into a hearing age on the curve above. Use headphones in a quiet room, set a comfortable volume before you start and do not change it during the sweep.
Laptop speakers often cannot play the highest frequencies, so a low result on them may come from the speaker, not your ears. The test is a quick check, not a medical diagnosis: if you notice ringing, muffled hearing or trouble following conversations, see a doctor or an audiologist. While you are at it, the color blindness test checks your eyes, and our guide to average reaction time by age shows another skill that changes as you get older.
Put on headphones and find the highest pitch you can still hear.
Because the hair cells in the inner ear, and the nerve fibers connected to them, wear out and never grow back. The cells that pick up the highest pitches sit at the entrance of the cochlea and take wear from every sound, so they go first. Loud noise, genes, smoking, diabetes and some medicines speed the process up.
The highest pitches start to fade in your 20s: most people under 25 can hear a 17,000 Hz tone, and many people over 30 cannot. Loss in the speech range usually becomes noticeable from the 50s or 60s. About one in three people aged 65 to 74 has hearing loss.
As a rule of thumb, about 18,000 Hz at 20, 16,000 Hz at 30, 14,000 Hz at 40, 12,000 Hz at 50 and 10,000 Hz at 60. The range shrinks by roughly 1,000 Hz every five years, but people of the same age can differ a lot, especially after years of noise exposure.
No. Human hair cells do not regrow, so the loss is permanent. Hearing aids and cochlear implants work around it, and protecting your ears from noise slows it down. Gene therapy has restored hearing in children with one rare inherited form of deafness, but not yet for age-related loss.
They can if the volume is high for long periods. At around 100 dB, a typical high volume, the safe limit is about 15 minutes a day. The WHO recommends staying within 80 dB for 40 hours a week. Keeping the volume under 60% and using your phone's headphone limit keeps you well below that.
Yes. The 2024 Lancet Commission estimates that hearing loss accounts for about 7% of dementia cases, tied for the largest share among 14 modifiable risk factors. That link does not prove cause, but in the 2023 ACHIEVE trial, hearing aids slowed cognitive decline by 48% in older adults at higher risk.
