There are already some great answers. So I just want to add some funny ones.
Here are some things you can say:
Standard
Enjoy your special day!
Have an awesome/great/fabulous/wonderful/spectacular/amazing birthday!
Funny
You're not 30; you're 18 with 12 years of experience!
Congratulations on surviving another year!
Congragulations on another year of skillful death evasion!
Happy “Welcome to the World Screaming and Naked' Day! (Use this only for someone you are really close to.)
I hope this is helpful.
联系客服