This view may be erroneous. I believe that women produce small amounts of ascorbate in their own bodies, while they are of child bearing age. But hormones will not do it all. With both sexes, osteoporosis can, and often is, very much due to malnutrition and reduced activity. Jogging, especially on pavement, can pound cartilage into dust.
Knee injuries are also common in skiing accidents.
Legs break more readily if they do not have full flexibility, and the twisting required to smash a tennis ball from the baseline can easily rip a cartilage of the knee joint. In bicycling, pumping up a steep hill puts intense pressure on the kneecap, so that, in extreme cases, the underside of the cap starts to fray. When teenagers and younger children undergo excessive training with heavy weights, they can damage their bones, and some doctors believe, stunt growth. Obviously, exercise should be done in moderation. But the more one does, the more he or she needs mineral ascorbates to help maintain the flexibility of his muscles and bones, plus other anti-oxidants and good protein.