Because when donating bone marrow, the hospital will strictly screen the donors. If they are sick or weak, the elderly will be excluded, so they don't meet some specific procedures in bone marrow donor. Only some people of the right age and strong physical fitness can meet the process of bone marrow donor. After they donate bone marrow, they usually have to carry out some recovery activities and keep some exercise every day, so that their bone marrow will grow again in a short time and they can return to their previous state. Therefore, this is a very complicated problem. Only people who meet the basic conditions can donate bone marrow, and the impact of donating bone marrow on people is generally not too great and will not affect people's health.
Moreover, some elderly people can't reach the donation target, so they won't donate bone marrow. If young people donate bone marrow, they can recover in a short time with certain exercise and recovery, because bone marrow can be regenerated. As long as you donate bone marrow, it will have a good effect on the body, not only will it not cause harm to the body, but it may also help the body. Therefore, when we donate money, we can handle it according to our actual situation. If our physical conditions don't allow it, then everyone should be cautious and don't take risks.