I sure do. It's surprising you would disagree, so I'd guess that you are either very young yourself, or unaware of the facts. I'm almost north of the 40 border and the interns and junior associates at work literally look like children to me.
I'm not a neurologist but it's pretty much understood and accepted that brains aren't fully formed until 24 or 25, particularly in terms of judgement and rational though and emotion.
I'm an SME in a technical field (tax) so I need only refer to literally any thread to see abundant examples of petulant whiny children screaming about technical shit they don't understand. I remind myself that these are very young immature people still wet behind the ears, with very little real word experience, before engaging them in debate.
Unironically yes. Of course when I was around that age I didn't but now I really do. As far as maturity I don't see a major difference between an 18 year old and 22 year old. So you attended school a few more years? Entered the workforce for a few years? That's not maturity imo but maybe I'm wrong. Maybe I wouldn't say child but definitely still in the teenager category imo although they're not actually teens ofc
It's a reasonable thought and I'm curious too. Didn't Treebeard call Gandalf young once, and Gandalf is like 8,000 years old or something?
That said, I haven't seen or felt much change from early 30s vs late 30s, compared to a huge difference from early vs late 20s. My dad is almost 70 and I think of him as young-ish. Certainly not old anyway (although I know plenty of people a bit younger than him that I consider "old".) I asked him recently what he considers old and he said 85 or so. Guess it's all relative.