The typical age range
Most women enter perimenopause between 45 and 55, with the mid-40s being the most common starting point, according to the National Institute on Aging. But averages hide a wide spread: some women notice the first changes in their late 30s, others not until their early 50s. Both are normal.
What makes it start earlier or later
- Family history — you often follow a pattern similar to your mother's.
- Smoking — can bring perimenopause on one to two years earlier.
- Certain medical treatments — some surgeries and cancer treatments can trigger it earlier.
- Ethnicity and health factors — can shift the timing by a year or two.
Earlier than expected: what to know
If you have perimenopausal symptoms before 40, that is worth a conversation with your doctor — it is less common and sometimes called early menopause or premature ovarian insufficiency, which can be checked with a blood test. It does not mean anything is wrong with you, but it is worth confirming.
How long it lasts
Once it starts, perimenopause typically lasts four to eight years, though it ranges from a couple of years to over a decade. It ends at menopause, after which many hormonal symptoms gradually ease. For what helps in the meantime, see our supplements guide and the full symptoms guide.
The bottom line
There is no fixed age for perimenopause to start — the mid-40s is typical, but a wide range is normal. If your symptoms and your age line up, you are almost certainly in it; if symptoms come before 40, ask your doctor to confirm.
References
- What Is Menopause? National Institute on Aging (NIH). nia.nih.gov
- Perimenopause. Mayo Clinic. mayoclinic.org