If I were to see someone who's 40 in a comic store, I might casually ask them "Hey, did you read Transformers when you were a kid? Yeah, cool, check this thing out, it's a continuation of Simon Furman's stories from way back then. Cool no?"
When I worked in a comic store that's what I did, I looked at people, asked them about what they liked, and tried to pair them up with stuff. It was so cool back then to be able to refine my skill and technique, much like a sommelier does with wine.
Far be it from me to give a veteran retailer like you any sort of constructive criticism, it's much more effective for you to Tilt at Windmills and punch at the wind. From what I understand, raging against the dying of the light usually results in MASSIVE sales upswings.