Online hearing test:
http://www.noiseaddicts.com/2009/03/...-hearing-test/
I suspect that results may depend, to some extent, on the quality of the playback equipment.
I can hear 14 KHz quite clearly but not 15 K. . . . unless I really crank up the volume and even then I can only just hear it. I also fair well in those perceptive pitch difference tests. Perhaps not bad for someone in their mid 50's. Then again I shunned the Strat and Marshall 4 x 100 W stack for a Lute when I was in my mid '20's.
What a great decision!!