Doesnt 21 mean he can buy us all beers now? It our way of celebrating not only your bday but our friendship as well. If we didnt let you pay then that would make us horrible people.
"Bartender, Im on his tab tonight"
Dont go blowing all your cash on booze and titty bars (Im guilty, I used to have a partying addiction but Ive gotten help for that, Marriage). Remember Supps, Rides, Room and Board and sometimes the girlie (sometimes) all need there fair share as well.
Congrats bro, You may start feeling old now but dont worry, you still got puberty to look forward too.
(my wife gets the credit for that one, she tells me that all the time)
db