[Well if he ever find himself in such a situation, being able to tell the age of them would be really important. He more meant- it's good to be able to tell a person's age because then you can gauge what experience they may have, as well as wisdom, and logic in certain situations- and not just one's involving young prostitutes.]

I feel properly discerning age could come in handy on many occasions- but yes, also socially. You are not the first to be alarmed by my age.