Perimenopause or “second puberty” is the two to ten years before the final period. It’s different from menopause, which is the life phase that begins one year after the final period. Symptoms, if they occur at all, occur mostly during perimenopause and are temporary.
The normal age for the final period is anywhere from 45 to 55, so the normal age for perimenopause is up to ten years before that—as young as 35. In other words, if you were born before 1984, you could be in perimenopause and yet still be relatively young. That’s why perimenopause is not about aging but is instead about an important (and unavoidable) recalibration of your hormonal system.