Where does “age” come from?

age (Anglo-Norman) comes from Old French aage, from Vulgar Latin aetaticum, from Latin aetās, from Latin aevitās, from Proto-Italic aiwotāts, from Proto-Indo-European h₂eyu-, from Proto-Indo-European h₂ey- — vital force, life, age, eternity; day, morning.

Ancestry of “age”, step by step

age traces back through two separate lines of ancestry.

via Old French aage

StepLanguageWordMeaning
1Old Frenchaageage
2Vulgar Latinaetaticumage
3Latinaetāsthe period of a life: lifetime, lifespan
4Latinaevitās
5Proto-Italicaiwotātsage
6Proto-Indo-Europeanh₂eyu-vitality; eternal; vital force, life, long life,...
7Proto-Indo-Europeanh₂ey-vital force, life, age, eternity; day, morning

via Old French eage

StepLanguageWordMeaning
1Old FrencheageAlternative form of aage
Every word from Proto-Indo-European h₂ey-Every word from Proto-Indo-European h₂eyu-Every word from Proto-Italic aiwotāts