Planet Mad

Twice in the past 24 hours I've been mistaken for someone far younger than I actually am. I am not sure if this is a good thing or a bad thing. After all, I'm no longer look young enough to blag cheap cinema tickets, yet I may still have to endure the embarrassing discussion that goes something like this:
Me: A pint of your finest beer, please barman.
Barman: Do you have any ID on you?
Me: Eurm - no.
Barman: Why not?
Me: Because I don't have any.
Barman: Why not?
Me: Because I am 26, I left university long before the millennium celebrations, and have been a responsible professional for over 4 years.
Barman: Whoops.