Since Jazzo is in High School and seems to be a pretty sharp tack-- it is unlikely that he has reached his legal majority for drinking-- most schools in US don't throw kids out till they have either graduated, (attempted to blow up the school) or turned 21.

He could be just turning 17-- a mere child! as Dicken's would say-- but I'm guessing he has become old enough to vote, or to be drafted (in time of war), and old enough to sign contracts--to wit- 18. Happy days Jazzo-- now and in the future!