The worst people I ever met were older. Here's why:
Pathologies ALWAYS get worse if not addressed. The longer you live your life in a hideous, immoral fashion, the worse you get. You never plateau and coast. You descend, and the descent picks up speed, you achieve critical mass, and suddenly you're a barking loon.
My memoir will not be at all Oprah-y. I choose to not reveal my own issues. But I will say that I can tell you from personal experience that problems not addressed always get worse, which is why older people tend to be sicker than younger.
If you catch your problems early on, you'll be better for it in the long run. Whatever problem you have now will get worse unless addressed.
Until around the age of sixteen I lived under a certain naivete that debauchery and scandalous behavior was largely a symptom of misguided youth... until I became aware of the number of people in the middle-age demographic that were cheating on their spouses, going to work drunk, racking up tens of thousands in debt and doing lines at parties. I lost a little faith in humanity that I have yet to recover... but if that's the worst of my first-world problems then I'd say I'm doing pretty well for myself. My own brief brush with what I perceive to be low-grade alcoholism makes me wonder how anybody can live so long like that.
Definitely looking forward to this book.