My older sister who is 74 has been on a low-dose estradiol patch since menopause and does not have osteoporosis.
I was diagnosed with osteoporosis in my spine two yrs into menopause. I was not on estrogen. Estrogen helps stop bone loss.
Also, Strontium Citrate is a supplement that has been shown to build bone density.
Much safer than prescription
bone meds.