^ilbb^ Salma is of course the gold standard I aspire towards (I'd step over most twentysomething dancers for a shot at her), but not that I hold myself to. At any given time, any supermarket in a gentrified urban area or an affluent suburb there are going to be at least 3-4 women in their 50s I would take for a no-consequences toss.
RockAllNight's age appropriateness scale is interesting. I'm assuming it is intended to apply to civvie women. There really shouldn't be any age standards in the SC, other than our personal standards. I personally steer clear of under-21 dancers in clubs where they are allowed, and there are no doubt young dancers who (foolishly from an economic standpoint) steer clear of my old ass.
Anyway, I doubt most civvie women in their thirties think they are fair game for men in their 60s. And, if I was 49, and relegated to women over 29, I would be looking forward to my 50th birthday when I could go back to hitting on 25 year olds. The sliding scale is valid in concept, though. I had a probably ill-advised conversation with one of my daughter's college classmates about the topic and she had a formula like half the man's age plus seven. It put Jennifer Lawrence just out of reach for me at the time.