As someone born 1990, its crazy what parents and their friends did

I remember parents and their friends drinking heavily through their 30s, 40s, 50s without much issue. It seemed normal. They all had regular parties, staying up very late. That’s just what they did. Never seemed burdened or affected by hangovers despite staying up late and partying. I dont ever remember any complaining about hangovers or struggles with drinking. I am barely at the start of their age and want to quit. Why does it seem so different now?