The Latin noun senex means an old man and senes is the plural: old men
It means an old man and follows the endings of rex, regis as it is a 3rd conjugation masculin noun.
Senes.
Senex.
Senator
Senex amat cogitare.
Old, aged, advanced in years or mature
John Senex was born in 1678.
Koyaga senex was created in 1881.
Pietro Senex died in 1134.
Aoraia senex was created in 1908.
Blenina senex was created in 1878.
John Senex died in 1740.
They had no particulat title that I'm aware of. An old man was a senex. If he were a sensible old man he would be senex sapiens, a wise or prudent old man, he was senex prudens, if he were an experienced old man he would be senex peritus. Out of the three connotations, senex prudens would be the most fitting term for a wise old man.
There is no such noun in Latin.The word senex means an old man, with the singular accusative form senem and the plural accusative senes.