Older women, 60+ who start HRT late have a 30-40% reduced fractures, dose dependent. Women that stay on HRT from menopause are said to have dramatically reduced bone fractures, about 50%+ better.
Benefits exist even when starting after age 70. It makes sense some bone benefits remain after stopping HRT, if on HRT for more than 15 years. In other words, the strong bones remain strong.
Put another way, no other treatment is as effective.
I've been learning all about this, due to disaster.
It may have benefits, but risks are much higher if you start HRT long after menopause.
The general consensus now is that HRT is safest and most effective when you start it within about 10 years of menopause or before 60. Starting it much later tends to come with higher risks for heart disease, stroke, blood clots, and in some cases cancer.
I started mine BEFORE my period stopped due to perimenopausal symptoms. I’m now 66 and my family doctor in Ontario recommended I stop when I turned 65. I figured he’s just a family doctor, so I asked to see a menopause specialist, and the specialist told me that I could stay on it as long as I still benefit from it, regardless of age. He said he wouldn’t start someone my age on HRT for the first time, and when I looked into it, what he said matched what I found: you want to start soon after menopause; otherwise the risks are high.
I read a book called Screaming to Be Heard, which debunked the flaws in the earlier studies and the interpretations of the results, and decided to get on bio-identical HRT at an earlier age even though a lot of women were getting off it in previous years. I’m glad I did.
I'm not saying you shouldn't start at 70+; you should just weigh the risks against the benefits carefully.
I feel for women who’ve been toughing it out without any HRT. I tried to get off it at the urging of my family doc before I met with my menopause specialist, and I was miserable. I was depressed, anxious, and dry everywhere (including down there), and the hot flashes were horrendous. I felt wrinkly and old, and it felt like my body was preparing to die.