Why does it matter to you? They are two consenting adults, and they are free to date whomever they choose, r238egardless of age. There's nothing gross about their relationship except for the hateful, judgmental people like you who contribute to the biased ignorance permeating from the worst of mankind.
Read my short story,
Cat's Milk
.
http://mstrainj7.wix.com/mstrainjr

I'm assuming your'e not a guy. When a gorgeous 23-year-old woman like her is willing to be with you, you roll with it, lol. Any man would, no matter what his age is.