I want to congratulate someone on their 40th birthday !!!

I don't just want to say happy birthday because that's boring and I wanted to add a funny tone to it ... something like this :

Did you finally become an adult ? )))
Welcome to the League of Grown Ups !
Don't worry ... you're not old ))) You've simply gained a level !

I translated it like this but wanted to make sure if it's any good (since I used google translate it may need some corrections/improvements) :

Ты наконец стали взрослыми? )))
Добро пожаловать в Лигу взрослых !
Не волнуйся ... ты не старый))) Ты просто получил уровень!

Thanks for checking / advice !
-saintbe