I just noticed the bowing of your lower
Legs, Bob.

This can happen with aging, but also
Happens if osteoporosis is in progress.

In males testosterone protects men into
Their 70's so:
You might investigate a testosterone
Test, a Vit D test to get a more accurate
Result to base your dosing on, and/or
Evaluation for Paget's disease.

Paget's is uncommon and often neglected
by doctors. Elevated alkaline phosphotase
Is one indicator. Also lots of spurring of
bones and increasing head size (requiring
Larger hat sizes) are also signs.

Paget's can go undiagnosed in many people
And is only treated when bone remodeling
Gets severe.

This is just an observation I had from
That one photo-- and not a criticism.
But your falls are concerning too IMO.