Where does “bătrâncior” come from?

bătrâncior (Romanian) comes from Romanian bătrân, from Latin veterānus, from Latin vetus, from Latin -tus, from Proto-Italic -tus, from Proto-Indo-European -tus — Derives action nouns from verb roots.

Ancestry of “bătrâncior”, step by step

Step	Language	Word	Meaning
1	Romanian	bătrân	old; old man
2	Latin	veterānus	old, veteran
3	Latin	vetus	old, aged, elderly, ancient; long-standing;...
4	Latin	-tus	Forms the past participle of verbs; Forms...
5	Proto-Italic	-tus	—
6	Proto-Indo-European	-tus	Derives action nouns from verb roots

Every word from Proto-Indo-European -tus →Every word from Latin -tus →Every word from Latin vetus →