You will have nay birthday's and parties to celebrate that. You will not have many Graduation parties.
Have the graduation party and you will be inviting many of the same people that you would for your birthday anyway.
Congratulations on the graduation and happy birthday.
You could host a birthday/graduation party
Agree with Julia- celebrate both! Congrats
My parents have given me the option to have either an 18th birthday party or a graduation party but I'm not sure which one to choose.