This might be a related area of research: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944195/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944195/ As a per

This might be a related area of research: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944195/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3944195/ As a personal anecdote, I am solidly middle-aged, and feel strongly that past & current negative experiences increasingly hedge me in if I don't actively fight against it. In many ways I've never fully recovered from some semi-disastrous events in my late teen years. Just getting through the essential drudgery of the day leaves me drained of all ambition to advance my position. The gas runs out and I stop caring before I can push through the frustration & uncertainty of a side project to get anywhere. And there's always more drudgery howling at the door. I seriously doubt I'm alone in this.