Formal Invitation to an adult's birthday party. The birthday person invite his / her friends directly.
[You are cordially invited to my [AGE]th birthday party on [DATE].]
[I am organising a small birthday party for my [AGE]th birthday party on [DATE].]
[There is a lot going to happen on [DATE]. It is my [AGE]th birthday party and you can’t miss it.]
birthday invitation letter,
adult birthday party,
adult birthday invitation letter,
formal birthday invitation letter,