climacteric
n. the biological stage of life in which reproductive capacity declines and finally ceases. In women this period, which results from changes in the levels of estrogens and progesterone and is known as menopause (popularly, change of life), typically occurs between 45 and 55 years of age and lasts 2 to 7 years. During this time, menstrual flow gradually decreases in occurrence, duration, and volume (a transitional phase called perimenopause) and finally ceases altogether, and various physical and potentially psychological changes, such as hot flashes, night sweats, joint pain, emotional lability, and depression, may occur in varying combinations and degrees. Some men undergo a similar period about 10 years later than is typical for women (see male climacteric). Also called climacterium. See also gonadopause.