"may still have had"?
If you are really concerned, get to a gym and have some fun. I do.
I still think supplementation will do the trick. I used to backpack and I still
lift, although the weights I lift these days are tiny. I have a lot of things to worry
about, but bone density just isn't on the list.
Once you find a good gym and learn how to work out (that can take a while), the gym is fun. Personally, I loved hiking and backpacking more than anything.
That would be a great way to build up some bone density.
Btw, a study with old fogies like me showed bone density increasing after exercising for a while.