Therefore, the only way to know if you have gone through menopause is if you have not had your period for one year. (And it's not menopause if your periods stop for some other reason, like being sick.) The average age of menopause is 51, but for some women it happens as early as 40 or as late as 55. After you go through menopause, you are considered in the post-menopausal stage of your life.
The umbilical cord develops from and contains remnants of the yolk sac and allantois (and is therefore derived from the zygote). It forms by the fifth week of fetal development, replacing the yolk sac as the source of nutrients for the fetus.
The umbilical cord is coated in a substance called Wharton's jelly, which serves to strengthen the cord and protect the blood vessels inside. The maternal end of the umbilical cord is attached to the placenta, which acts as an intermediary between the umbilical cord and the mother's circulatory system. The other end attaches to the fetus in the abdominal area (what will later become a person's navel or belly button).