You're one fourth of the way to 100, way to go.

Happy Quarter of a Century!

Happy 25th birthday.

Congratulations, you've made it to a quarter of a century.

Wow, you're twenty five.
Can't believe your still alive.

Congratulations, you've made it half way through your 20's.

Happy 2 dozen plus 1.

Hope your 25th birthday is really special, just like you.

Hoping that all your dreams and wishes come true on your 25th birthday.

Congatulations on turning 25, now you're officially old.

Happy 25th anniversary of your birth.

You're only 25 once, so enjoy it while it lasts.