[PaulHoule]

Accumulated epigentic damage? (Is it bad to born to older parents? The same environmental poisons that made us all fat since 1980?)

Less tolerance for difference in the public schools? (It used to be you were different, now you get a diagnosis)

[coldtea]

Some biological damage (from microplastics, pollution, etc), some social, some "path of least resistance" when economic conditions favor it, and probably all together: extreme rat race, extreme individualism, extreme narcissism, loneliness epidemic, depression epidemic, reduced sperm potency...