I know I'm BU really, because if you stop and think about it, blowing all over a cake that someone else is going to eat is a bit revolting. It was never on my radar as a child though and birthday cake candles were an exciting treat; being sung to, blowing them out, making a wish, the scream as you cut the cake.
My DC are 10 & 13 and won't even entertain the idea of candles on their cakes. It just feels so flat.