Old women often don't fall and "break a hip"....what happens is a bone BREAKS, causing them to fall....and yes, ACTIVITY does help.
Yep....I tell my ladies strength training class that all the time. The youngest participant is 51...the oldest 76. You should see them do what they never thought they'd be able to do when they started. I never have them on any machines. They use all free weights, stability balls and bodyweight.