I've had these on and off since I was 19!
On and off meaning they were there absolutely all the time for a while, then at some point I realised they were something I "used to" have, then they re- appeared after my first baby was born in my 30s, then at some point I noticed again that I "used to" have them rather than still having them...
They reappeared for years at around your age actually, but reading your post made me realise that I never noticed when they went away, but I haven't had them in years (in my 50s now).
When I had them at 19 it didn't even occur to me to see a doctor or optician about them, I just joked about them with my friends! Mind you I don't think I ever went to a doctor except the family planning clinic where I got the prescription for the pill and my smear test! Odd because I religiously attended dental checkups...
When I got them in my 30s I did mention them to the optician as I had glasses by then (late developer in terms of short sight). The optician was largely uninterested and did check my eyes but said they're just one of those things.
I lived in a different country in my 40s where I went to an opthalmologist (specialist eye doctor) as was normal there - more extensive check ups, same result with the additional comment that it was my age 😝 but they might go.
Actually the opthalmologist didn't say they'd always been there, but that they form and disappear (crystallise from normal fluid maybe? It was a long time ago) and of course are vastly smaller than you think, some people have them and don't notice, once you've noticed it's hard to ignore but all normal and nothing to worry about as long as you've had an eye health check.