Mosquito Tone — the 17 kHz Sound and What Hearing Age Means

1. What exactly is a mosquito tone?

A mosquito tone is simply a very high-pitched pure tone. Three properties define it:

• It is a single sine-wave frequency, not a mixture — everyday sounds stack many frequencies, a pure tone contains exactly one.
• It sits somewhere between 15 and 18 kHz, with 17.4 kHz the most quoted figure.
• It lives just below the ceiling of human hearing, which at its youthful best spans roughly 20 Hz to 20 kHz.

Purity is what makes it useful: because the tone contains one pitch and nothing else, hearing it or not hearing it is a clean answer about your ear's response at exactly that frequency.

The band it occupies carries almost no speech or music content, which is why losing it goes completely unnoticed in daily life. You don't miss the top floor of a building you never visit.

2. Why the top frequencies fade first

The inner ear converts vibration to nerve signals with thousands of microscopic hair cells arranged along a coiled membrane. The cells tuned to the highest frequencies sit right at the entrance of the coil, where every sound passes over them first. They take the most wear, and unlike skin or bone, these cells do not regenerate.

Everything that passes through that entrance adds up over a lifetime:

• Loud venues — concerts, clubs, sports crowds.
• Headphone listening, where volume and hours matter more than the gear.
• Occupational noise, from workshops to kitchens to trackside work.
• Decades of ordinary traffic and city background, which is quiet but constant.

The result is the most predictable pattern in hearing: sensitivity to the highest pitches declines gradually from our twenties onward, a process called presbycusis. It is ordinary wear, not a disease.

That is also why the mosquito tone works as a rough age probe — the ceiling of what you can hear drifts downward decade by decade, fairly consistently across the population.

3. Hearing age — a fun estimate, not a diagnosis

"Hearing age" flips the pattern around: if 17 kHz is typically audible to people under about 24, and you can hear it, your ears are — in this one narrow respect — performing like ears younger than 24. The commonly cited rough map goes:

• 17 kHz — usually audible under about 24.
• 16 kHz — under about 30.
• 15 kHz — under about 40.
• 12 kHz — under about 50.

Treat those as folklore-adjacent averages rather than medical categories. Genetics, noise exposure history, and even today's ear fatigue shift your ceiling by whole kilohertz, so two people of the same age landing two steps apart is entirely ordinary.

And crucially, the high-frequency ceiling is one narrow slice of hearing. Real audiology measures sensitivity across many frequencies at calibrated loudness in a controlled room. A playful frequency check can never substitute for that — if anything about your hearing worries you, see a professional regardless of what any web page told you.

4. Where mosquito tones are used in the real world

The age-selectivity of high frequencies has been used deliberately. The best-known case is a loitering deterrent installed outside shops that emits a loud tone around 17 kHz: unpleasant for teenagers, inaudible to most adults, and controversial enough that several cities have debated banning it. The same physics spawned "teen-only" ringtones that students could hear in class while teachers could not.

There is an engineering lesson hiding in both, and it matters before you test yourself. Audibility is not only about the listener:

• Small speakers, especially in laptops and phones, roll off sharply above about 15 kHz.
• Compressed audio formats often discard the top band entirely to save space.
• Video platforms re-encode uploads, so a clip's mosquito tone may not survive the trip to your screen.

When someone "can't hear" a mosquito tone from a video clip, the equipment is a suspect at least as strong as the ears — and it is the cheaper one to rule out.

5. Trying it yourself — the right way

A browser hearing frequency check plays pure tones from low to high and lets you find where your audible range ends, right on this site, with nothing uploaded anywhere. Four steps make the result mean something:

1. Find a quiet room, because background noise raises your effective threshold.
2. Use decent headphones and confirm both sides work with a headphone check — the speaker's ceiling otherwise becomes your ceiling.
3. Start at low volume and raise it gradually, one small step at a time.
4. Stop at a normal listening level. If you cannot hear a tone there, that is your answer.

Step three is the one that matters for your ears rather than your score. Never max out the volume hunting for a tone you cannot hear: if it suddenly does play, that jolt is exactly how you damage the hearing you set out to measure.

And if no tone plays at all, suspect the equipment before your ears — the sound-settings device selection described in our guide on a microphone not working governs output as well as input, and picking the wrong device is a silent failure in both directions. Otherwise, treat the number you get as a snapshot of today: fatigue, background noise and gear all nudge it. It is a fascinating peek at your own ears — enjoy it as exactly that.