Earlier quoted context omitted.
In the US at least, the 21 yo drinking age is mostly a wholly pragmatic law [EDIT: laws. It's state by state but there was a big federal stick attached to highway funding.] to reduce teenage drunk driving (which affects more than the individual). Tobacco sales is mostly 18 in the US (although a few states are 21). Casinos also vary although the drinking age restricts It's hard to make an intellectual case for dispari…
The drunk driving argument extends to Japan extremely poorly due to cultural and infrastructure differences. Public transportation in Japan is great. In urban areas it's also quite easy, accessible, and affordable to rent a capsule hotel "room" or net cafe seat. This is true no matter what your age or credit history, they won't ask for your drivers license, you can pay cash. It's honestly strange that I have to state…
It's mega strict.