Funny, the nearest supermarket would be an hour round trip on my bike. Ther'es a corner shop but i don't recall every seeing cakes in there, apart from stuff like sickly galaxy muffins.
ummm! How dare you!! You're never ever too old to have birthday cake, I still expect and get a birthday cake every year and when it was my mums birthday bought her one too, and probably will make one for my dad this year as it is a 'big birthday'!