How old are you?

48 but one knee is 30 and the other is 60.  I walk up stairs sideways.

Three score and ten.
Talking of classes, my wife was in Elton John's class at Pinner High when he was plain young Reg Dwight.  At 15 he was banging away at the piano saying he would be famous.  Just like Bob Dylan and Paul McCartney - seems to be pre-ordained for the true greats.

65. I had the pleasure of selling 'hi-end' audio from the late 70s thru the mid 80s and 'stereo' was a hobby even before then. I can still hear fairly well even after selling Klipsch during that time period. Music has been my go-to all these years and still is! :-)))

60.Starting building my own gear while still in high school. Bought my first gear at 18.  (Sansui integrated, Philips turntable)  I have now have the best system I've ever had (ARC, B&W, PS Audio, McIntosh etc.) as I head hopefully quite slowly towards the sunset.

66. First concert....Grand Funk Railroad at Boston Garden. 1969?