people don't change
That is a terrible way to look at things.
Of course people change, I did, and so have a lot of people.
It's just easier to point out the people who haven't yet, because they are still as immature and dumb as ever.
Everybody changes eventually, throughout their lives.
It's a part of growing up.
I cringe extremely hard when people say nobody changes, because they don't even realize how different they acted in the past, and they don't act the same way.