Bone loss can be a factor but i am not sure how much it really matters, at your age especially i doubt it could be the main actor.
Subcutaneous fat loss is much more likely what determines old looking faces, try to compare pictures of yourself from 15 years ago or so to now and you should notice where the issue is, likely fat loss in your upper cheeks leading to skin sagging.
Unfortunately it looks like there is not much that can be done, DMAE topical at 3% might help.
"DMAE, in the form of facial cream, is being looked at for improving skin quality for aging skin when applied as a 3% facial cream.[4] It shows benefits in improving the appearance of coarse wrinkles, under-eye dark circles, nasolabial folds, sagging neck skin, and neck firmness and is generally very well tolerated.[citation needed]
Most notably, DMAE as a facial gel increases skin firmness.[6][7]"
https://en.wikipedia...hylethanolamine
In my experience don't expect miracles but I heard different reports from different people, for some it works quite well while for others it doesn't makes much of a difference.
Some form of face yoga or face exercises might work by a mechanism of "bodybuilding" your facial muscles leading to more volume replacing the fat loss.
Other than that it seems that only cross-linked hyaluronic acid fillings or autologous fat transplant are reasonable ways to fix the issue but be aware they are not permanent solutions (and are expensive AND need to be performed by SKILLFUL plastic surgeons for good aesthetic results).