In our house we use one candle no matter how old you are.
One of my 87 year old patients told me, "you look good for 46". I love my job:)
http://www.bonappetit.com/recipe/cocoa-layer-cake and I could not decide which one I liked better. Good thing I don't have to choose. Here is the link to Dorie's recipe: http://www.npr.org/templates/story/story.php?storyId=6504932