25 is still pretty young too and some of the cringiest behavior is people at that age acting as if they were still 17 (though not as bad as 45 year olds acting like they are 25 or 60+ year olds acting as if they were in the single digit ages).
Yeah, 13-15 for me. Although I've spent all my teen years behind a computer and didn't socialize at all, so I was pretty weird overall. Well, I still am, but at least I can at least talk with strangers with no issues, although I still get nervous very rarely and talk nonsense.
I still prefer my adulthood, because at least I am no longer bullied, I am not forced to do bullshit homework, and I don't need to learn stuff that I won't ever need in my life, but instead I can focus on learning stuff that either I am deeply interested in or has any practical use in real life.