"But you're 18, right?"
"Nope. 14." They couldn't believe it.
When I was 19, I looked sufficiently old that was able to play blackjack at small stakes in Reno. I didn't play slot machines, because there was always a chance that I'd hit a sufficiently large jackpot that they'd have to issue a 1099, which would mean producing ID, which would (at best) result in the jackpot being forfeited.
Well, now that I'm 49, I find myself getting senior discounts applied to my meals without being asked (or without me asking).