I've had an account since I was like 11 or 12, and savings bonds that I got when I was 11 and 12, but didn't really use the account much until I started getting jobs that paid decent money, when I was 16, and I got a checking account shortly after I turned 18 because I had to have it when I went to Iraq, or else I wouldn't be able to buy anything over there.
My local bank pays .25% interest. Those buggers.
EDIT: I forgot, they changed it. They don't pay 1/4% interest anymore. They pay 1/5%. Damn them.