A view from someone who spent a decade in retail sales.
Once you've been in the trade for a few years, you can peg most anyone who walks into the store. My guess is that for each 22 YO cigar smoker, there are 99 22 year old Hookah smokers.
Is it "right?" No. But I understand where the retailer is coming from. He enjoys cigars and sells hookah stuff to the youngsters because it is a necessary evil of staying in business. Underneath, he is annoyed at the very thought of selling it because he would love to talk cigars all day.
Trust me. Once you get to know him, you will be one of his favorite customers because he knows you "break the rules." I will go so far as to say he'll treat you like a king.