Yes, I have seen people change, it’s called development/evolution/growth.
It. So do people change? Is there proof of it? Yes. You were not the same person that you were when you were seven. You're not the same person you were when you were 14, so forth and so on. About every seven years you get a refresh in your biology, everything. So, yes, people do change. Have you never changed anything about yourself, your opinion about anything in your life?