Shojo Beat, Dec Issue
The “Leftover Christmas Cake” actually used to refer to single women once they hit 25. This is because Christmas cakes sell well until the 24th, but no one buys them once it’s the 25th. This “the younger the better” is probably one reason why “enjo kosai” (paid dating) is so prevalent here. I’ve read about men paying 3-5 man to have sex with a minor, and even up to 10 man if the girl is a virgin.