The three stages of menopause are perimenopause, menopause, and postmenopause. Perimenopause is the transitional phase leading up to menopause, characterised by fluctuating hormone levels and irregular menstrual cycles. Menopause itself is defined by the cessation of menstruation for 12 consecutive months, typically occurring around the age of 50. Postmenopause refers to the stage following menopause, where hormonal levels stabilise, and menopausal symptoms diminish.