That sounds like a pretty good definition. But I'm commenting here because I don't think the terms are as black and white as they seem. I mean if someone has osteoporosis at say 70 and doesn't have any of the medical conditions listed and has not taken any of the meds listed as causers of bone loss does that really mean they have a condition called primary osteoporosis that is somehow different than secondary osteoporosis?

I think it's just as likely that we cannot identify all the reasons osteoporosis develops in one person and not in another. Just because we cannot identify them in 2024 does not mean in the future we won't be able to. Or even that a smart of enough doctor or nutritionist or researcher or patient might not be able to identify more causes today.

I'm a 73 year old male so no post menopause issues. I had extra tests done as suggested by Lani Simpson. She and I could not identify any definite secondary factor for my bones continuing to worsen rapidly. So I'm taking Evenity hoping that will improve my bone density but I don't see that thinking in terms of primary vs secondary is very helpful, at least for me. I think I have more going on than just getting older but at present I cannot figure it out. So Evenity, resistance exercise, supplements in a do everything reasonable I can type approach. Hopefully that will be enough to build some bone back no matter what is causing the faster than normal decline.