What do you Think happens once they stop working?.
They just move on. get other jobs. get boy friends become wives.
Think of all the girls in Sex industry around the world. When have you ever met a woman in her 40's and been like yup. Previous WL.
Just like of the thousands of men you meet in your lifetime. You can never really pick out who's a regular punter and who is boy scout clean.
Few years back when I was friends with a mamasan just chatting at coffee shops around Stratty. So often she'll say high and chat up with random Korean girls who are all completely normal with boyfriends, going to school, doing cosmetic procedures. And then say afterwards previous WL.