Menopause is defined as the absence of your menstrual period for 1 year. Menopause usually happens between 40 and 55 years of age, and one-half of women experience it before the age of 51.
Premature ovarian failure or insufficiency is when the ovary stops functioning before the age of 40 years of age and happens in less than 1 in 100 women and pregnancy must always be considered when a woman experiences absence of her menses early in life.
The age of onset of menopause varies and may have a familial component. Women with many children and higher weights experience menopause earlier, while those who have no children, smoke, or have been treated for depression can experience it earlier.
Perimenopause or menopause transition consists of irregular ovarian function usually 5-7 before actual menopause and up to 1 year after the final menses.
The change in hormones during perimenopause is often responsible for the clinical signs and symptoms that many women experience.
Women aren't the only ones who go through menopause. Read HERE