[Garraty]

I, myself can hear up to just shy of 16,000 Hz (approximately 15,875 Hz) and I'm 21 so that seems right. When posting, remember to put down your age and the frequency. That's all.
 
EDIT: Took another test, made a mistake. I can apparently hear up to around 17,000 Hz upon further listening, it's just a bit faint.
 
EDIT 2: I'm testing tone generators and I'm not sure if the ones I took before were accurate- perhaps the tones were compressed? (took the prior tests on YouTube since the downloads seemed to be full of bloatware) For some reason anyway, I used this website (http://onlinetonegenerator.com) and I can hear around 17,700 Hz at low volumes but after that I can only really hear it begin and stop. 

 

[MixingWizard]

I can just about hear 18k (it's very faint though) and I'm 24 and a gigging musician - I guess I just got lucky so far! My girlfriend is 22 and she can still hear 20k - I'm pretty jealous.

 

[RainHeaven]

17 and I can very faintly hear 20khz. 

 

[Sekka]

18 and I can hear up to 23khz through sine waves generated in Audacity. 20khz is pretty painful at normal listening volume.  About the same on random online tests.
 
It obviously isn't accurate, even newborns aren't supposed to be able to hear anything over 20khz.  Self-administered hearing tests don't seem to be very reliable.

 

[MixingWizard]

  18 and I can hear up to 23khz through sine waves generated in Audacity. 20khz is pretty painful at normal listening volume.  About the same on random online tests.
 
It obviously isn't accurate, even newborns aren't supposed to be able to hear anything over 20khz.  Self-administered hearing tests don't seem to be very reliable.

Might be some kind of harmonic distortion causing lower frequency tones? I guess it isn't impossible though!

 

[Oregonian]

52 and 15.5 on a generator I found online. 

 

[system11]

40 and 16, my tinnitus is 15khz

 

[jodgey4]

College aged, ~17.5kHz.

 

[rids57]

57 and just under 14kHz using SineGen

 

[Vitriform]

19 years old here. At normal listening volumes, I can hear to around 17kHz. At louder volumes, I can (very faintly) hear up to around 18.3kHz. Tested with mda's free TestTone VST in FL Studio.

 

[FastAndClean]

16kHz

 

[nehcrow]

35 KHz, get on my level
 
Seriously though, I'm not going to test. All those loud music festivals have probably done their fair share of damage, too scared to look at the results

 

[astroid]

15khz but i can sense women approaching at 250 yards.

 

[jbarrentine]

42 years old, 15kHz.