AKA Temporal Agent Daniels. 42 today. Or, in the 31st century, 42. http://www.imdb.com/name/nm0935616/ Hey, he was in Fight Club!
He can make it so it's his birthday EVERY DAY. And go back and celebrate again and again. What about temporal duplicates? Do they have the same birthday, or do they celebrate the day they were created?
I'm with you on the swoonage. Birthday every day? Sure – although I imagine after a while one ODs on cake.