I grew up in a conservative muslim household with a tight knit small muslim community so uh very skewed view. Also eldest daughter very rule follower golden child people pleaser. Also control freak with a fear of any form of loss of control (eg: being drunk). So no I did not drink a single sip of alcohol until 22 and even then it was one spritz, and not again since. I know some people in high school who drank, but I was in the honors classes and all my other golden child nerd friends didn't really. The ones who did usually drank with their parents like having a few sips of their wine or having a beer with the family kind of thing.
In high contrast, my younger sister, similar upbringing started drinking much earlier. I don't know too much about the early times we weren't close enough then, and maybe still aren't now, but she definitely drank in high school and partied regularly in college before she was 21, I want to say starting at 16/17. Not completely sure. But definitely way more than I could've ever wrapped my head around at that same age.