In addition to the cell phone post.
Contrary to popular belief, a woman never wants her age on her cake!
I am not sure there is a woman alive that wants someone to purchase a cake for her, throw a party for her, whether it's a small intimate gathering or a big party, and have her age be the centerpiece of the affair.
Other than celebrating age because of tragic events, and the likelyhood of not surviving this long, there is not another reason to have a woman's age advertised. I have never has someone ask to put a man's age on a cake; interestingly enough. Oh, once, yes once, for a surprise party. I'm sure he was just as thrilled.
Well, I take that back. A woman did order her own cake once and ask that her age be part of the decoration of said cakes. But that was only once. The others have been by sisters (don't even think of it), brothers, sons, daughters etc. It seems the only people that do not need to be told this are husbands. At least they've figured that part out. ;-)
If you feel differently, let me know.