How old is Sonic the hedgehog in game anniversary?

I thought in his mid 20s

In a gaming show, they đã đưa ý kiến that Sonic is 15(Sonic was 15 in the comics when he started hoặc something) and then he had his birthday in the games that makes him 16. But I say 15. And in the comics, he is 18.

Well for the the actual canon he's 15, but since he had a birthday he's 16. People might say he's in his 20's that's because of the franchise's anniversary. That's what I think though...

Sonic characters in-universe do not age. Despite having a birthday, Sonic is still canonically 15.