Origin and Etymology of is. Middle English, from Old English; akin to Old High German ist is (from sÄ«n to be), Latin est (from esse to be), Greek esti (from einai to be)
For the medical journal, see Menopause (journal). Menopause, also known as the climacteric, is the time in most women's lives when menstrual periods stop permanently, and they are no longer able to bear children. Menopause typically occurs between 49 and 52 years of age.
1 Because men, on average, have a greater muscle mass and a lower body-fat percentage than women, they generally have a higher basal metabolic rate. 2  Age. 3  BMR is greater in childhood than in adulthood. 4  After age 20, BMR is estimated to drop about 2 percent to 3 percent each decade. Because men, on average, have a greater muscle mass and a lower body-fat percentage than women, they generally have a higher basal metabolic rate. 2  Age. 3  BMR is greater in childhood than in adulthood. 4  After age 20, BMR is estimated to drop about 2 percent to 3 percent each decade.