Menopause
The menopause transition typically begins between 40 and 50 years of age (average 47.5). The duration of perimenopause may be for up to eight years. Women will often, but not always, start these transitions (perimenopause and menopause) about the same time as their mother did.
North American Menopause Society
The North American Menopause Society (NAMS), founded in 1989, is a nonprofit, multidisciplinary organization with the mission of promoting the health and quality of life of women during midlife and beyond through an understanding of menopause and healthy aging. Based in Cleveland, Ohio, NAMS has more than 2,000 members from 51 countries, with 88% of its members from North America.Its membership includes experts from many disciplines such as medicine, nursing, sociology, psychology, nutrition, anthropology, epidemiology, pharmacy, and education.