Getting winked at as a cashier?

So basically I work in a grocery store and I'd say I'm attractive, but the point is that guys that at my register wink at me a lot? Basically when someone's comes up to your register greets you and simultaneously winks at you... When older men (60+) do it, It's most definitely a way of greeting someone. But recently I noticed a lot of guys of my age are doing the same, and I haven't seen a single girl do this...

Should I just see their winking as a non-verbal greeting or interpret it differently?
Getting winked at as a cashier?
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