America's legal is 21 lol
Is there any other country with a legal age that high?
If I'm understanding this right.. at 18 you can do porn , can vote what happens to the country, can get killed in war , make life decisions , except drink alcohol. You too young for alcohol.
It's to do with the scientists at american universities. Their research implies that the human brain isn't fully developed until at least age 20 and that alcohol is most damaging before that age, and given the proximity to our legal system, they've got the level of influence to impose the research. Not like it matters that much. Besides, if someone younger than 21 wants to drink that bad, they'll find a way.