I think the best way to celebrate a birthday is to go away on a quick getaway. Somewhere remote, braai everyday, relish the days from sunrise to sunset. Granted this is not always possible, but its awesome to do.
For me its a case of trying to forget about the day. Birthdays tend to be disappointing. I try to spend the day with Nima, we order our favourite food, game and watch movies kinda thing.
Never been a big celebratory party person myself. Prefer birthday celebration is a quiet braai or home-cooked dinner, pecan pie, a nice bottle of wine and a whiskey, some decent coffee.