Birthday Invitation Message

I will celebrate my birthday girls. They are partying (not surprising).
One is the age of 21 and 18 others.
Can anyone help me find a funny message for the invitation?

Celebrate a legal drinking age of 21yr old name {}
and an age for us to start {} 18yr old name on the door of the university.

May not be what you want, but these are things that have been signifigant with those ages for me.