At the age of forty, there may be residual breasts among the breasts, which are related to the time of one’s own childbirth. However, it is usually a pathological phenomenon. Usually after weaning, there is still residual milk in the breasts, which the body can gradually absorb on its own. If you give birth later, for example, after the age of 35, it may be normal to have residual milk at the age of 40, as long as there is no abnormal sensation, and the milk can be absorbed by the body slowly. However, if you give birth earlier, the residual milk will be gradually absorbed at the age of 40, and usually there will be no residual milk. If you find juice overflowing from the nipple, it may be a case of nipple overflow. Some diseases such as mastitis, ductal dilatation, breast hyperplasia, breast cancer, etc. may cause nipple overflow. It is recommended to observe your condition in time and seek medical treatment when your breasts become swollen and painful, or when there is abnormal fluid overflow.