What motivates people to change?

Time is passing by and people change. But which are the reasons? I will enumerate some of them:

• age: the age is an important factor because with the age you get mature and start thinking in other way;
• stress: when you are under the influence of stress you are totally different;
• money: they can have a good but also a bad influence;
• children: once you have children you are more responsible and you need to change;
• marriage: it makes you more serious;
• moving: some people can't accommodate easily to a new place so it can change them;
• experiences: all the things happen with a reason and sometimes they are to learn from them;
• friends: they are those ones who can change you without saying anything;
• a job: it can change radically a person;
• problems: all kind of them makes you vulnerable;
• dreams: fighting to make them true can change you in a positive way;
• standard of living: if you want to be as the majority you must strive to achieve a standard;
• love: no comment :);
• fame: it can destroy a person;
• technology: is an important factor of the 21st century.

Did I forgot something? What do you think?