>To answer to the original question, I don't think personality change once set.
I think there are many cases where adults can suffer a chronic health problem e.g. chronic pain, or say the loss of a young child, which can cause fundamental personality change.
Some people also experience what is sometimes called in English, an "epiphany", generally meaning a positive, life-changing insight or experience.
Regards. Al
"Violence is the last refuge of the incompetent." -- Isaac Asimov
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