Where does “γέρος” come from?

γέρος (Greek) comes from Ancient Greek γέρων, from Proto-Hellenic *géronts.

γέρος (Greek): old man

Definitions

Step	Language	Word	Meaning
1	Ancient Greek	γέρων	an old man; elders, i.e. a ruling or advisory...
2	Proto-Hellenic	*géronts	—

γέρος — Etymology, Origin & Word History | Etymology Explorer