Well this is RPG memes and 100 is when an elf is considered an adult in DnD so
That is how it works (legally and culturally)
Of course it’s also a medievalish world and they didn’t care that it ruined brain development. I guess you might argue that dwarves and elves would though, particularly since a brain damaged drunken youth is going to be a problem for a lot longer


So, just like a human teenager, there’s a difference between physical maturity, mental maturity, and the age their brain finishes developing?
Regardless, the threat to call their parents is still valid and players should absolutely do it if they have an elven teenager PC