geronto-
combining form
: aged person : old age
gerontology
Word History
Etymology
borrowed from Greek, combining form from geront-, gérōn "old, old man," going back to Indo-European *ǵerh2-ont- (whence also Sanskrit jarant-, járan "old, decayed," Ossete zærond "old, old man"), participial derivative from the base *ǵerh2- "become old, ripen" — more at geriatric entry 1