as in could walk into a school or college pretending to be a student and nobody bats an eyelid, that people who are actually that age think you are in their peer group or if their parents saw you with them they would think you were just part of the gang…that doesn’t happen.
It does happen and someone has made a film about exactly that called: “My Old School”. It’s also not unheard of among refugees, if they claim to be a teenager they get access to education.
If you honestly think you look 18 in your 30s, go stand beside an actual 18 year old and take a selfie. I don’t mean that in a nasty way but seriously, time doesn’t just stop for some people
I don’t mean this in a nasty way but why are you’re this invested in people’s age on the internet? Maybe you need to look at your attitude to aging? I’ve seen some 18 year olds look 30 and some 30 year olds look 18.
You make the same mistake as a pp assuming that this is about people walking around thinking they look young. I just walk around trying not to fall over. Some people give random feedback I haven’t asked for. Perhaps they mean it to be complimentary, but like the OP it just feels to me like I come across as not having my shit together.
And y’know if it hadn’t happened to me personally maybe I would say the same - 10 years fine but not 20. But from my experience now I’d say that with some people it’s actually hard to tell how old they are if you don’t know their context. And how old someone appears depends as much on their mien, behaviour, character, attitude, as their visual appearance.