Organ and tissue donation affords men and women a unique opportunity to help others. Although the laws vary depending on where a person lives, many persons age 18 or older can indicate their desire to be organ donors. Younger people must have a parent or guardian's consent. Physical condition will dictate if a person can donate, although people with a previous medical condition may still be suitable donors. According to the United States Department of Health and Human Services, each organ and tissue donor has the potential to save or improve the lives of as many as 50 people. Organs and tissues eligible for donation include the heart, pancreas, lungs, liver, kidneys, intestines, cornea, skin, connective tissues, and bone marrow, among others. In the United States, donors can register with a state donor registry or designate their decisions on their driver's licenses. Canadians can visit beadonor.ca to register to become organ donors.