AML patients with FLT3 mutations were older than those without mutations (average 11.5 yrs vs. 7.3 yrs, P = 0.01 by t-test); ALL patients with FLT3 were slightly but not significantly older (6.4 vs. 5.5 years average, P = 0.4, t-test). The gene discussed is FLT3; the disease is acute lymphoblastic leukemia.