If by date you mean the kind where you get all dressed up and shy/nervous, try to impress the other person you're with, take them out to a nice restraunt and then to the movies where you pay for everything and always hold the door and prove that you are a big giant dork, no, I've never been on one of those...and I'm 21.
But if by date you mean had a girlfriend or did date type things like taking said girlfriend out to dinner (without going all out and dressing up and making a fool out of yourself), then I probably started around 16, maybe a couple years younger.