I'm not making a judgement either way, Moxie (about longevity). And I said "almost different sports" not "separate sports." A subtle but crucial difference.
Let's be honest: the men's game is played on a much higher level. I don't know if I agree with John McEnroe, but he said that the top 500 ATP players could beat Serena Williams, probably the best woman player ever. I say this not to put down the women, but to emphasize that the higher level involves different dynamics - of power, speed, strength, etc, all of which are impacted by aging in different ways.
In other words, we can't really compare things like longevity or prime age ranges because of the different dynamics that the male/female and level involve.