Originally Posted by rayb2

Nice.
As regards the question - I first measured my bone mass as part of a research project 40 y ago (for the nerds out there - dual photon absorptiometry as it was pre-DEXA.) Since then, I've tended to always wear hip padded shorts when commuting and touring, and after flipping a track bike a couple decades ago, I have elbow protection as well.
Might not want to wait until your 8th decade of life to check how much bone mass you're starting with - a baseline can be helpful. In my case, if my first bone mass was yesterday, folks would be scrambling to get me medication. As my doctors know I haven't lost bone mass throught the decades, there's some reassurance I can continue on with my program.
Jus' a thought.