There is no universal cutoff for how long you can take estrogen. Current guidelines from the North American Menopause Society (now The Menopause Society) state that hormone therapy does not need to be routinely discontinued at any specific age, including 65, as long as the benefits still outweigh the risks for you individually. The old advice to stop after five years has largely been replaced by a more personalized approach.
That said, the safety profile of estrogen shifts depending on your age, how long ago you went through menopause, whether you take estrogen alone or with a progestogen, and how many years you’ve been on it. Here’s what matters at each stage.
The 10-Year Window After Menopause
The strongest safety data applies to women who start estrogen before age 60 or within 10 years of their last period. In this window, the benefit-risk ratio is clearly favorable for treating hot flashes, night sweats, and preventing bone loss. Women who started hormone therapy within six years of menopause showed a 32% reduction in coronary heart disease events compared to those on placebo.
The picture changes the further you get from menopause. Women who began hormone therapy 10 to 20 years after menopause had a 23% increased risk of heart disease. For those starting more than 20 years after menopause, the risk jumped to 66%. This is often called the “timing hypothesis,” and it’s why when you start matters as much as how long you stay on it.
Continuing Past Age 60 or 65
The Menopause Society’s 2022 position statement is clear: hormone therapy can be considered for continuation beyond age 65 for persistent hot flashes, quality-of-life concerns, or osteoporosis prevention. The key is periodic reevaluation with your clinician to confirm the benefits still justify the risks. There is limited data from randomized trials on women over 65, though observational studies suggest a small potential increase in breast cancer risk with longer durations of use.
For women who started estrogen in the favorable window and still have symptoms, continuing therapy is a reasonable option. The decision isn’t about hitting a birthday and stopping. It’s about regularly checking whether your reasons for taking it still apply and whether your health profile has changed.
Breast Cancer Risk by Duration
Breast cancer risk is the concern most women ask about, and the numbers depend heavily on whether you take estrogen alone or combined with a progestogen. For estrogen-only therapy starting at age 50, five years of use raises the cumulative breast cancer risk from 6.1% to just 6.3%, a difference of 0.2 percentage points. Ten years raises it by 0.5 points, and 15 years by 0.9 points.
Combined therapy (estrogen plus a progestogen, typically prescribed for women who still have a uterus) carries a somewhat higher risk. Five years of combined therapy brings the cumulative risk to about 6.7%, and 10 years raises it to 7.7%. These are absolute numbers, not relative ones, so the actual added risk remains modest in context. Still, this is the main reason guidelines recommend periodic reevaluation rather than indefinite use without discussion.
Premature Menopause Changes the Equation
If you went through menopause early, whether from surgery, chemotherapy, or primary ovarian insufficiency, the guidelines are different. The American College of Obstetricians and Gynecologists recommends that women with premature ovarian insufficiency continue hormone therapy until at least age 50 to 51, the average age of natural menopause. This isn’t optional in the way that treating hot flashes might be. Early loss of estrogen significantly increases the risk of osteoporosis, heart disease, and cognitive decline, and replacement therapy offsets those risks.
For these women, the years of therapy before age 50 are considered replacement rather than supplementation. The duration clock that applies to women going through menopause at the typical age doesn’t start ticking in the same way.
What Happens When You Stop
Bone loss accelerates rapidly after stopping estrogen. In the first two years after discontinuation, women lose bone at the same rate as during the first two years of untreated menopause, roughly 1.5% to 1.6% per year at the spine. If osteoporosis prevention is one of your reasons for taking estrogen, stopping without a transition plan can undo much of the benefit.
Hot flashes and night sweats also return for many women after stopping, regardless of how long they’ve been on therapy. Research on whether tapering the dose works better than stopping abruptly is surprisingly mixed. Randomized trials found no difference in symptom recurrence or in the likelihood of staying off therapy at one year. One observational study found tapering produced fewer symptoms initially but made women more than twice as likely to restart hormone therapy. There’s no clearly superior method, and the choice is largely a matter of personal preference.
What Ongoing Monitoring Looks Like
If you stay on estrogen long-term, expect an annual visit that includes a breast exam, pelvic exam, review of any new health concerns, and reassessment of your symptoms. Liver function should be monitored periodically. If you’re taking estrogen for bone health, bone density scans are typically repeated every one to three years to confirm the treatment is working. Your clinician will also watch for signs of blood clots, particularly calf tenderness or swelling, since venous thromboembolism is one of the known risks.
The practical answer to “how long can you take estrogen” is: as long as the reasons you started still exist, your health allows it, and you’re checking in regularly. For most healthy women who begin in the favorable window, five to ten years is common. Some women stay on it well into their 60s or 70s. The right duration is the one that reflects your symptoms, your risk factors, and an ongoing conversation rather than an arbitrary deadline.