At what age does perimenopause start?

Bottom linePerimenopause usually begins in the mid-40s but can start in the late 30s or early 50s, lasting about 4 years on average before menopause at around 51; early menopause is before 45 and premature ovarian insufficiency before 40 (about 1 in 100 women). Family history is the strongest predictor, smoking can advance it, and certain treatments can cause it suddenly; see a doctor for symptoms before 45 or no periods before 40.

Perimenopause usually begins in your mid-40s, but the range is wide - it can start in the late 30s or as late as the early 50s.

Typical timing

• Most people: symptoms begin in the 40s
• Average menopause (periods stopped for 12 months) is around 51
• Perimenopause lasts on average about 4 years, but ranges from months to a decade

Earlier than usual

• Early menopause: before age 45
• Premature menopause (premature ovarian insufficiency): before 40, affecting about 1 in 100 women
• Can be influenced by genetics (your mother's timing is a clue), smoking (tends to bring it earlier), and medical treatments like chemotherapy, radiation, or surgery to remove the ovaries

What can affect timing

• Family history is the strongest predictor
• Smoking can advance it by a year or two
• Certain surgeries or treatments can cause it suddenly

Why knowing matters

Recognizing perimenopause for what it is helps you manage symptoms and make informed choices about contraception (still needed) and treatment.

When to see a doctor

• Symptoms before 45 (to confirm and discuss options)
• No periods before 40 (to check for premature ovarian insufficiency)
• Symptoms disrupting your life

Read our perimenopause and menopause guide.

Femora's stage-aware tracking helps you recognize the perimenopausal transition as your cycles change.