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).
Yanomami
The start of "menstruation" symbolizes the beginning of womanhood. Girls typically start menstruation around the age of 12-15. Girls are often betrothed before menarche and the marriage may only be consummated once the girl starts menstruating, though the taboo is often violated and many girls become sexually active before then. The Yanomami word for menstruation ("roo") translates literally as "squatting" in English, as they use no pads or cloths to absorb the blood. Due to the belief that menstrual blood is poisonous and dangerous, girls are kept hidden away in a small tent-like structure constructed of a screen of leaves. A deep hole is built in the structure over which girls squat, to "rid themselves" of their blood. These structures are regarded as isolation screens.