The transplant team will consider many different people as potential donors. Immediate family, relatives, or close friends are preferred since they are most involved in the potential recipient's health. The donor must have a compatible blood type and must also be similar in size to the recipient. Most important, the donor must be in good physical and mental health, with no significant history of major medical problems, liver disease or excessive alcohol use. The transplant team will consider donors between the ages of 20 and 50 if they are in good health.