You'll get people ridiculing you for not remembering your own age but believe you me, you're not alone in the struggle. My husband and I started dating in 2000 so that's awfully convenient.
My wife and I started dating in 2000 as well. Got married in 2001. The math is in my favor for remembering how long we've been together and our wedding anniversary.
I never had a problem when I was younger, but as I get older (I'm not even that old) it gets harder. Not REALLY hard or anything, but having to pause to remember how old I am sometimes makes me feel a bit slow.