Yeah you are right it doesn't matter what you or I think in this situation. It's up to the girl. But she is sharing this info with a punter... A customer... While doing business... For example if a girl lists herself as D cup but the punter sees her and posts on here she is actually a cup... We aren't saying something to him. Same with age, it's listed on the bio. It's not kept completely private. Usually the shops are using age to deceive punters trying to make us think the girl is younger than she is. So it depends on the context.
But at the end of the day, if you want something to be private then don't share it with someone who is a customer. And in this case it seems the girl clearly doesn't want that info shared so it's good that the post has been edited to comply with her wishes.