This is just my observation. Like anything involving people the best you can do is correlation (too many outliers), but the driving factor seems to be people ge

This is just my observation. Like anything involving people the best you can do is correlation (too many outliers), but the driving factor seems to be people get locked into a path early in their life and find it hard to walk away from all they have committed to their specialisation when they later find they don't actually like what they have spent their life becoming good at.