Did you mean how celebrities age or how some CTB ????
I've thought about this as well. Many people in the entertainment industry seem to CTB after 30. (Some before)
Probably some of it is the stress of the business. I think some former child actors may not know how to handle when they can't get more acting jobs.
I check out the site deadline.com and it seems there are many suicides. Although I think some aren't listed as suicide for the family.
There was an actor who CTB a few weeks ago ? Who shot himself in the chest. I think he was about 50.