geriatrics (n.)

"medical treatment of children; the branch of medicine dealing with the study of childhood and diseases of children," 1884; from pediatric; see -ics.

1909, formed in English from Latinized forms of Greek gēras, gērōs "old age" (from PIE root *gere- (1) "to grow old") + iatrikos "of a physician," from iatros (see -iatric).