Effect of donor age and donor relatedness on time to allogeneic hematopoietic cell transplantation in acute leukemia.

•Factors associated with time to transplant were analyzed.•Multivariable analysis was conducted using data at our center for patients with acute leukemia.•Related donors were significantly older than unrelated donors.•Age of donor did not correlate with time to transplant in multivariable analysis.•Using unrelated versus related donors required 35% longer time from diagnosis to transplant.•Studying outcomes when using older related versus younger unrelated donors is needed.