There seems to be a real tendency to want to narrow the band of what a functioning adult is, centered right around whatever age the poster happens to be at.

Anyone > 65 should be considered senile until proven different. After all, it's not kids that get scammed out of their retirement funds.

That's not my opinion, but it might lead to changes.

The reason that 25 number came up is that's how old the cohort they were studying brain development got when their funding was cut. There's no reason to not believe brains continue developing all our lives, or that even if that study did find a "cut off point" that it would be the same from person to person.

People over 65 should be banned from voting, driving, and accessing the internet

Just like a child.

sure, not like people under 25 need to work, pay rent, take care of their own finances and responsibilities, or anything. we’re all just kids living with our parents and when we turn 25, we magically become adults! oh, wait…