The requirements for blood stem cell donation are that anyone under the age of 60 can be a donor. Of course, the younger the better. Young donors are most suitable as donors because of the high metabolism of blood stem cells in bone marrow; some older people, such as those younger than 60 years old, can also be donors of blood stem cells, but the older the donor, the older the donor, the more the donor has some diseases, such as hypertension, diabetes or heart disease, which are not suitable as donors; hepatitis patients are also not suitable as donors. Therefore, donors are required to be relatively young, and people without major diseases can be donors, and there is no harm to the donor itself by contributing blood stem cells.