I don't think that is necessarily true, and as I showed in this post, the Dutch are clearly defying that, as are the many German cyclists.Bones need impact to offset osteoporosis.
What extended stays in the zero gravity of space has shown us is that the joints and bones need gravitational pressure and muscular pressure. Given non impact exercise while in those circumstances they remain healthy.
I can point to my own case. I've cycled much of my life and as my many posts on the subject show, always in the sensible traditional fashion of long ago, far slower than most in Britain in recent decades. I've never cycled off road/emtb etc. Apart from some very rare sports field running in earlier school days, I've never run and certainly have never jogged, but I have done extensive very low impact leisure walking.
Now as I'm about to enter my eighty-seventh year, I thankfully have no arthritis and no damaged joints, just the usual shrinking in height we all have in our last decade or so as we replace less and less of our cells each year.
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