I started when I was about 8 (give or take), and am now 42. So I've been gaming for about 34 years (+/-).
BTW I started gaming with the grand-daddy of them all...PONG. The first console I actually bought with my own money was the classic NES, and have owned every home console since then, including all the more obscure ones such as the 3DO, Jaguar, Neo-Geo, Turbo-Grafx 16, & others). Plus I've played countless Arcade game kiosks. GOD, I feel so old. :|
I got a Sega Megadrive for Christmas on my 6th birthday. I remember it because we had opened all our presents and just as we were starting to tidy up our mum and dad said to look behind the sofa. WOW! A huge box! What could it be? A Sega Megadrive! Whooo!
Probably played games before that but thats my earliest memory of it all. So yeah Ive been gaming over 20 years as Im now 28.