One example doesn't prove anything, but neither does saying "this is the case, I'm right".
(For what it's worth I have a semi-unrelated anecdote: I'm 25, and in the UK if I buy alcohol or cigarettes in a t-shirt and jeans then I'd estimate I get asked for ID maybe 90% of the time in a shop or 50% in a bar, if I wear even a shirt and jeans, yet alone something smarter... I don't think I've been asked for ID dressed like that in years. Now I live in France though, and haven't been ID'd here ever.)
(For what it's worth I have a semi-unrelated anecdote: I'm 25, and in the UK if I buy alcohol or cigarettes in a t-shirt and jeans then I'd estimate I get asked for ID maybe 90% of the time in a shop or 50% in a bar, if I wear even a shirt and jeans, yet alone something smarter... I don't think I've been asked for ID dressed like that in years. Now I live in France though, and haven't been ID'd here ever.)