Yes, because he's wonderful and deserves it and makes him happy. The kids make him a card, we give him breakfast in bed, the dog wears a happy birthday balloons, we take him to dinner, have dessert at home, etc. For his 40th I threw him a surprise party.
For me, not really because I hate concentrated attention on me and have always hated my birthday. I would have an actual happy birthday if we just ignored the fact that it's my birthday.