Frogs, DEXA scans are quite expensive, so they need to be justified in terms of outcomes - and I'm not sure they are.
I take hormone blockers after breast cancer, so have had two DEXA scans and am due to have a third one later this year. My mother broke her hip when she was in her late 50s, which is an additional risk for me.
I have confirmed osteopenia. The second DEXA scan showed that the condition was deteriorating faster than would be expected for my age (hence the third scan). Nevertheless, I haven't been prescribed anything. I've been given advice about taking a daily Vit D supplement and was told that my normal diet has enough calcium. I was given some fairly vague advice about weight bearing exercises. Medications for osteoporosis can have horrendous side effects and I would be reluctant to take anything, unless absolutely necessary.
The point I'm making is that bone density decreases with age anyway. It can be slowed down but never cured completely. A person's bone density is built up in childhood years and decreases naturally during adulthood.
If somebody with confirmed progressive osteopenia (me) can't be treated other than with lifestyle advice, there's not much point diagnosing it in the first place, so money spent on DEXA scans could be spent elsewhere.
It's inevitable that bone mineral density decreases with age even if there are no symptoms. Therefore, everybody (especially those over about 60) should make sure they have enough calcium and Vitamin D, do some weight bearing exercise (even if it's only chair exercises) and learn how to minimise the risk of falls and to fall "properly" when it happens.
The NHS might be wiser to spend money on subsidised exercise and wellbeing classes for people of a certain age (which would also help other conditions).