senis
senis is a Latin form of senex, meaning “old man; old”. It is the genitive singular masculine adjective.
Found 157 times in the Latin texts on Socratos.
Where it is used
Caesar, De Bello Gallico 1.15.3: Ita dies circiter XV iter fecerunt uti inter novissimum hostium agmen et nostrum primum non amplius quinis aut senis milibus passuum interesset.
Terence, Phormio 1.2.63: Senis nostri, Dave, fratrem maiorem Chremem
All forms of senex (declension table)
Source: Socratos (socratos.org), a free reader for Ancient Greek and Latin. Grammar from the Perseus Treebank and Morpheus; dictionary entries from Lewis & Short, A Latin Dictionary (Perseus Digital Library, CC BY-SA). Counts are from the texts on Socratos.