A good thing to remember is that we rebuild our bones every 10 years (I've even read on some ortho sites that its every 7 years). And we continue to do that until we die....So....we just need to be conscious of what we're putting in our mouth that helps bone growth, what hinders it, be sure to stay hydrated, and exercise. As a bone doctor told me a few years ago when I was sent to him for a -3.4 score, it depends on heredity, diet, bone architecture, bone strength, etc not just on a DEXA score which actually doesn't measure TRUE density (mass per unit of volume), but measures AREA density (mass per unit of area). Plus, he told me that my bone loss was most likely due to all the prednisone I had been on for many years....which, if I got off of I could probably speed up bone growth fairly quickly.