Dictionary entry

γῆρας

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

γῆρας, Attic, gen. (-αος) -ως, dat. ; Ion. and κοινή, -εος (-ους), dat. -ει, τό,

[in LXX for שֵׂיבֶה, etc.;]

old age: ἐν γήρει, Lk 1:36.†