I feel like I estimate a lot of people on here to be younger than they really are. I can't remember any specific examples, but there have been a few times when I've had my mental image of someone being in, say, their 30s, then it'll come out in a post that they're in their 50s.
That is me in my avatar, so you don't have to guess my age. And yes, I do wear a suit and tie while drinking a cold beer and reading the paper.