For what it’s worth, I’m 79, small boned and have shrunk to 5 ft. I see 2 endocrinologists and have had my forearm scanned at the same time as my spine and hips for the last 2 years. The forearm has a reading of -4.1 and I visualize it snapping every morning when I do my plank routine. Both doctors say that is unlikely but who knows. And both say there is little that current meds can do to built the type of bone in the forearm. Equally depressing, they view the readings for my spine, which are pretty good, as totally worthless due to my scoliosis and the number of bone spurs that are being seen as “bone”. So we are focusing on maintaining stable readings at the hips. Getting older isn’t for wimps!