i was 15, but if you were to ask how long i've been seriously playing i'd tell you about 6 months. I'm 18 now, so I'm kind of behind everybody because i wanna go to music school but i dunno if i can make it. i can play with any jazz band or whatever, i just don't know the theory! it sucks man, because i know i could do some cool stuff on my beautiful fender deluxe player's strat if i could sort the sounds in my head to notes on the frets!
I got my first guitar when I was thirteen. I didn't start getting way into it until just recently, though.
I think I was fourteen though I had been playing the piano for 7 years before that. I still play both instruments.
I was 14. Didn't really like it though so I went back to my prefered woodwind instruments and started Clarinet. :3