Do you think people's habits change or they stay the same?

For example, you have that one friend that is always fashionably late. Many years you’ve known her to be that way.

Or that one cousin you have that is super tight with money and it’s so annoying because it affects what you do when you hang out with her like finding coupons before hanging out, making you pay her for gas when you get a ride even if the two of you made plans together

or that one ex that always forgot to call because he was more into his video games and never kept a real job because it wasn’t good enough for him so he had money issues that you had to put up with.

Things like that. Do you think most of the times people’s habits stay the same or change?