Perimenopause typically lasts around 4 years on average, but the duration can vary widely from a few months to as long as 10 years or more. Some sources note it can last up to a decade or even longer in some cases

. It usually begins in the mid-40s but can start earlier or later depending on individual factors

. Perimenopause ends when a person has gone 12 consecutive months without a menstrual period, marking the official onset of menopause

. The length and experience of perimenopause are highly individual, with symptoms and hormonal fluctuations varying significantly from person to person

. The transition includes early and late stages, with increasing irregularity in menstrual cycles as it progresses toward menopause

. In summary:

• Average duration: about 4 years
• Possible range: a few months to 10+ years
• Starts usually in mid-40s but can vary
• Ends after 12 months without a period (menopause)

This variability reflects the unique hormonal changes and symptoms each person experiences during this natural life stage