14 years here. I've been playing Animal Crossing, and Nintendo in general ever since I was 5. Ironically, my earliest game I remember playing is Sonic Rush on the new DS Lite my friend owned (We sadly have lost touch in the recent years). A Sega game that got me totally into Nintendo. I got my first real DS Lite at about 6 or 7, if I remember right. It's top screen broke, but it still works after all this time. Still here 8 years later with my shiny red 3ds, and hoping to get the new 3ds when it arrives. It will be my 4th handheld, my 5th Nintendo system in general.
I'm 21 and I started on New Leaf when it came out last year! It's all thanks to my friends that I started; they told me how good this version of it was so I played it while waiting for Pokemon X and Y to come out, and I play it more than Pokemon now! ^^