21 for alcohol!? Sounds like USA lol. Poor you, you can't even get a can of beer (not your fault though, they should lower that instead of doing shit overseas.) Anyway until you mentioned that 21 thing I was kinda wondering where you lived. I live in cananda and even some 14 year old can get a can of beer (with help from 18+) so if you can't get anyone to buy you alcohol then I don't think you'll be able to find absinthe (it's kinda hard to find in US/canada) because its illegal. In places like Germany they permit up to 80% alcohol or around there so absinthe is legal, but in North america.... I've never heard anyone around here that got absinthe. (but in canada salvia IS legal hehe, or at least never heard it wasn't). Anyway, good luck finding absinthe! (btw, I don't know exactly how much absinthe is a can of beer but if absinthe is 70% and beer 4-10%, then it's like way less than one shot...)

Peace,
Dewave.