Do people chage?

Today I want to ask this question: How many people change throughout their life?
By change I mean the change in charector, habits etc.
And I am considering only changes after adult years. After 18 to be precise.
So, think about friends or family member you know for many years, typically decades.
How much each of them chaged over years? People who were funny is still a funny guy? Serious guy is still a serious guy? Shy is shy and bold is bold? Do mother and father keep fighting over the same littly things they used to do a decade back?

Let me take more precise examples. Is late sleeper is still a late sleeper? or person who is always late is still a late comer? or that friend who was extra cautions and an avid planner is still so?

And more interestingly, What about yourself; how much you have changed after your teen years?

I think people do not change. Almost all changes in oneself are results of dedicated efforts and most do not put that effort. As a result, almost all late comers would remain to a late comer throughout their life, and shy would remain shy. Well there will be changes according to age, but comparing to their peers they would be in the same place in the normal curve.

So ask these questions to yourself and let me know.