Women tend to exercise less frequently than men. It's interesting that the article says this is true of women over 70. With men dying younger than women, I wonder if men over 70 are more active than men who don't make it to their 70s, making it seem as if men are more active than women.
An article on the Grant study, following over 200 Harvard men from the early 1930s. Healthy aging factors include "mature" adaptions, education, stable marriage, not smoking, not abusing alcohol, some exercise, healthy weight.