People who attend adolescent gatherings over the socially acceptable age who attempt to persuade younger participants in sexual exploits.
People who pursue 'jail bait'.
People who look very much older than their partner, especially if their partner looks very youthful.
Person 1: "Did you see Mike over there hitting on that high schooler?"
Person 2: "He is so stach, he is old enough to be her dad!"
Person 1: "That guy is totally statch"
Person 2: "Why does John's parties always attract these pedophiles?"
Person 1: "Jason's girlfriend is so statch"
Person 2: "Why, because she used to be his babysitter?"