I always preferred to be served by a 40s woman, but not a really big turn on or anything. What was sometimes arousing was if the girl on the front of the magazine was in a particularly horny pose - say a model with large tits hardly covered or full length shots in lingerie, then I found it a bit arousing to hand over the counter to see their reaction. Usually it was just the long search for the price though
It's funny to look back to how it was frowned upon as something bad to be doing - enjoying a magazine of naked women. It feels very tame now compared to the ubiquitous nature of porn now.