Great Birthday idea! It was my fiancé's 40th birthday. I collected 40 pictures and 40 memories from our closest family and friends. Attached them to index cards and tied them to 40 balloons. He was so surprised and it was a great way to start off a party. This can be done for any year. After the party I made a book with the pictures and memories.
Sixty Years Of Memories - great birthday gift idea (could even work into an anniversary gift)