system
Given the following post, respond as if you're commenting on Reddit:
human
Can someone, say aged 30+, have a complete personality change?

How malleable is a personality after developmental years? How possible is it, per se, for a 45 year old incel living with his mother and having never had sex before to become a world famous pick up artist?  Is it possible, even with the worlds greatest coaches and unlimited money? Is that even what it would take? 

How about bitter old racist woman to sweetest most loving person on earth?

I could keep listing off examples but I feel you get the idea of what I am getting at. 

Curious to see when the brain is “too far gone” or “too engrained” for real change. 10% I can see happening with hard work, but a 55 year old lazy man who never worked a day in his life to suddenly becoming the next Gary V level of hard work and hustle? 

My thoughts were always after 30, you’re maybe at most 25% adjustable, which is attainable by either a major religious or near death experience or sudden access to wealth. 

Anecdotes would be nice (we all know David Goggins story) but for most people, what would you say?
gpt
I feel that you get "personality" a little wrong. You´re talking about specific behavior connected to specific beliefs and perceptions about the world and the people in it. That does usually origin in the personality but it´s not the personality. 

That said - personality itself usually does not change a ton anymore after the mid-twenties. But the way it expresses can change massively. 

Imagine someone being racist because they believe that all POC are out there to get them. Then one day they end up in a car crash and a POC ends up saving their life. This could change their believes about POC which then results in them not being racist anymore when at the same time - because there´s a personality thing going on tending to "need" someone to be the bad guy - they develop a personal crusade on people drinking because the person that crashed into their car was drunk whilst driving. 

Personality is more like the core base of what a human is likely to do or feel or experience or rather how they´d perceive that. How they act based on that is a whole different ballgame and extremely complex.