Menopause
Menopause typically occurs between 49 and 52 years of age. The majority of women have their last period between the ages of 48 and 55. The average age of the last period in the United States is 51 years, in the United Kingdom is 52 years, in Ireland is 50 years and in Australia is 51 years. In India and the Philippines, the median age of natural menopause is considerably earlier, at 44 years. The menopausal transition or perimenopause leading up to menopause usually lasts 7 years (sometimes as long as 14 years).
Female promiscuity
It is common for sex drive to diminish dramatically after menopause. A number of studies, including Alfred Kinsey's, have concluded that the average age group in which women are the most active sexually is their mid-thirties, one study liberally estimating 27-45 as the limits of the age group (the average man peaks earlier). Women in this age group typically report having sexual fantasies greater in number and intensity, engaging in sexual activity more frequently, and being more interested in casual sex.