Perimenopause: Age, Stages, Signs, Symptoms & Treatment (Cleveland Clinic)

Tier 1: Established: peer-reviewed research or government health authority
Publisher: Cleveland Clinic · Published: August 13, 2026 · Accessed: August 13, 2026

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Claims this source supports

• Perimenopause may begin as early as your mid-30s or as late as your mid-50s.
• During perimenopause the ovaries begin producing less hormones, and hormone levels commonly fluctuate, going up and down rather than declining in a straight line.
• The average length of perimenopause is about four years, but it can last up to eight years.