Ramana Maharishee said: "You who wish to celebrate the birthday, seek first whence was your birth. Your true birthday is when you enter that which transcends birth and death - the eternal being. On your birthday you should mourn your entry into life. To glory in it, and celebrate it, is like decorating a corpse."
To celebrate the birthday is to celebrate the ego, and is to fight against destiny. Only when life and death have been transcended can destiny play its joyful games unrestricted.