The oldest coin I own now is an 1814 bust dime in F+ condition. For a couple of days, I owned an 1802 large cent AG/G but returned it because it was pretty scratched up.
BTW OP, in case you haven't learned this in coin collecting yet, age has very little to do with value. While its cool to have older coins, most people feel that way, it doesn't mean they are worth anything. My my expensive coin is 2300 years newer than my oldest, but worth 200 times as much.
well I do have some ancients and even a Han dynasty coin (0001ish) but I think my oldest "dated" coin is a 1732 Duit (NY penny)