We sought to elucidate the influence of donor age in living donor liver transplantation (LDLT) using either left lobe (LL) or right lobe (RL) grafts.Recipients (n = 232) were categorized as: group O/LL (LL, donor age >50, n = 20); group Y/LL (LL, donor age 50, n = 12); and group Y/RL (RL, donor age < or =50, n = 61). We compared post-LDLT graft functions.Among LL LDLT, the incidence of small-for-size syndrome was significantly greater for group O/LL compared with group Y/LL (60.0% vs 16.3%, P < .01). However, the cumulative 5-year graft survivals were 73.8% in group O and 76.7% in group Y without substantial difference. In RL LDLT, the post-LDLT morbidity and mortality were similar for group O/RL and group Y/RL.Partial liver grafts, even though LL grafts, from older donors can be used safely with caution in LDLT.