How long perimenopause really lasts
The classic answer is "4 to 8 years," and that's true on average — but the spread is huge. SWAN (the Study of Women's Health Across the Nation, the largest cohort we have) tracked over 3,300 women through the transition. The middle 50% spent 4–8 years in perimenopause, but the full range was 2 to 14 years.
The strongest predictors
- Mother's age at menopause — adds or subtracts 4+ years from your estimate.
- Smoking — brings menopause forward by ~1.5 years on average.
- Ethnicity — SWAN found Black and Hispanic women had longer transitions and earlier hot flush onset.
- BMI — higher BMI correlates with later final period and longer vasomotor symptoms.
Symptoms can outlast perimenopause
About a third of women have hot flushes for 7–10 years after the final period. Vaginal and bladder symptoms typically worsen after menopause without treatment because tissue is sensitive to estrogen loss. So "how long until it ends" depends on which symptom — vasomotor symptoms taper, urogenital ones don't.
What can shorten the rough bit
HRT, prioritized sleep, strength training, protein intake of 1.4–2.0 g/kg, and cognitive behavioral therapy for hot flushes all reduce symptom severity. They don't shorten the underlying biological transition — but they shorten the amount of time it makes life hard.
Track every month of your transition.
Lila keeps a running picture of your cycles, symptoms and what's improving — so you know exactly where you are.