Although it changes it is still in the human range, close to your original personality, and the delta is negligible. Your brain is essentially the same.
I'm not a neuroscientist so I won't argue that point. I think as far as self-improvement and personal growth is concerned, however it seems that at least on a surface level that people can alter their behavior. Again, whether they are hard-wired to do so because of brain structure I don't know.
