Another reminder that I am getting old

Yesterday at Ian's birthday party, it was time for the cake and singing of happy birthday. Apparently, the number of candles you leave lit when you make your wish is the number of girlfriends you have (Ian has 2 if this is to be believed). Has anyone else ever heard of this? Either I am (a) living under a rock, (b) reaching a new age of pre-teen motherhood or (c)getting old!