It does slightly blow my mind that people can, in one breath, insist that people never fundamentally change, that redemption is impossible, and then, in the next, insist that they believe they can learn things and how embarrassing they found their younger selves.
People don't change unless they want to but they can do it. Older people can learn things, older people can change how they live their lives.
I didn't say it was easy, but it happens. Your personality isn't set in stone.