Sixty as the new forty: considerations on older related stem cell donors.

The era of reduced-intensity allogeneic stem cell transplantation, with its emphasis on older patients, has created new challenges in the management of what is now an older related stem cell donor population. These donors are now on average no less than 10 years older than in the mid-1990s. Donors over 70 years of age are no longer isolated or exceptional cases. They may still be considered eligible for donation but many of them, based on the older age and their medical history, may no longer fully qualify as 'healthy' or 'normal'. The older the donor, the more likely that hematologic abnormalities, comorbidities and treated malignancies will complicate the picture. Assessing the risk-benefit ratio for both donor and recipient can now be more challenging than ever.