Anyone between the ages of 17-55 and in general good health can register to become a blood stem cell donor. If you are 17, you can complete the registration process, but will only be added to the registry after your 18th birthday.
The upper age limit is in place to protect the safety of the donor and to provide the best possible treatment for patients. Younger people are more likely to be chosen as donors and are less likely to have health issues that could cause complications with donating. With age there is also an increase in risk from anaesthesia.
Find out more: Eligibility to register as a blood stem cell donor.