The main reason that people talk about how people should do low impact activities is that the joints wear out over time. People become immobile. lack of exercise kills them.
sounds like you dodged that bullet.
My problems stem from a broken leg suffered as a high-school freshmen (compound fracture, both bones just above left ankle). When set, that left foot was angled about 5 degrees more "out" than the right one. I thought even then that when I got older I would have joint problems. One of the few times I wished that I had been wrong. When I hit 65, things started going sour (74 now). Thought sure I was headed for knee replacement. So far, WBV seems to have stalled (and even reversed) the deterioration.