Does HRT after 65 actually harm women? What the data shows

What did @stephanie_misanik actually say?

She claims a study of over 10 million women on Medicare proved that continuing hormone therapy past 65 reduces risk of death, breast cancer, heart attacks, blood clots, and dementia. Her conclusion: "if your doctor is telling you it's time to stop HRT because you've reached a certain age, get a new doctor."

The study she's referencing appears to be a 2024 observational analysis using Medicare claims data published in Menopause (the journal of The Menopause Society, which she calls "the Metapaw Society"). The researchers compared women actively using hormone therapy to non-users across a range of serious health outcomes. The numbers she cites, including a 19% lower risk of death and 16% lower breast cancer risk, appear to correspond with reported hazard ratios from that dataset.

She also uses the video as a direct pitch for NAVA, a telehealth clinic she's affiliated with. That's worth noting when weighing how the findings are being framed.

Does the science back this up?

Partially. The study's associations are real, but observational data from insurance claims cannot prove that HRT caused these better outcomes. That distinction matters enormously here.

The core issue is something called the healthy user bias. Women who continue taking hormone therapy into their late 60s and 70s tend to be healthier, wealthier, more engaged with preventive care, and more likely to have doctors who monitor them closely. All of those factors independently reduce mortality and disease risk. A Medicare claims database cannot fully control for that, no matter how large it is.

This is not a new problem. The observational data before the Women's Health Initiative (WHI) also looked promising for HRT, which is part of why the WHI's 2002 randomized trial results were such a shock. Manson et al. (2013, JAMA) later showed timing of initiation matters significantly, a nuance this TikTok ignores entirely.

The study is genuinely large and the associations are worth taking seriously. But "proved" is not a word observational research earns.

What did they get wrong (or right)?

They got the broad strokes of the study's findings right. The associations reported, lower all-cause mortality, lower rates of several cancers, lower cardiovascular events in active HRT users, do appear in the data. Credit where it's due: the creator is correct that age-based cutoffs for stopping HRT lack strong randomized evidence and that guidelines have been shifting.

What they got wrong is framing association as proof. Saying this study "proved" that HRT protects long-term health is inaccurate. The word choice is doing real work here, pushing viewers toward a conclusion the study's own design cannot support.

They also strip out important nuance. HRT is not a single thing. Estrogen-only therapy carries a different risk profile than combined estrogen-progestogen therapy. Route of administration, dose, timing of initiation, and individual patient history all matter. The Rossouw et al. WHI data (2002, JAMA) and subsequent reanalyses by Hodis and Mack (2022, Climacteric) make clear that blanket statements in either direction, HRT is dangerous or HRT is protective, miss most of what actually determines individual risk.

What should you actually know?

The evidence base for HRT has genuinely improved since the early 2000s panic. The current consensus from The Menopause Society and the British Menopause Society is that for most healthy women under 60 or within 10 years of menopause onset, the benefits of HRT for symptom management and bone protection outweigh the risks. That is a real shift from older blanket warnings.

But the picture for women over 65 who are initiating or continuing therapy is more complex, not settled. Researchers like Crandall et al. (2023, Menopause) have pushed for more nuanced risk stratification rather than age-based cutoffs, which is a reasonable position. That is not the same as saying the question is closed.

If you are being told to stop HRT at a specific age without a clinical reason, asking your provider to walk through current evidence is fair. But a TikTok citing a single observational study is not a substitute for that conversation. The creator's advice to seek providers familiar with current research is reasonable. The advice to treat this study as proof of universal long-term safety is not.