Meaning

noun how long something has existed

noun an era of history having some distinctive feature

noun a time of life (usually defined in years) at which some particular qualification or power arises

originEtymology tree Proto-Indo-European *h₂ey- Proto-Indo-European *-u Proto-Indo-European *h₂óyu Proto-Italic *aiwom Proto-Indo-European *-teh₂ Proto-Indo-European *-ts Proto-Indo-European *-teh₂ts Proto-Italic *-tāts Proto-Italic *aiwotāts Vulgar Latin aetātem Proto-Indo-European *-h₂ Proto-Indo-European *-éh₂ Proto-Indo-European *-tós Proto-Indo-European *-eh₂tos Proto-Italic *-ātos Vulgar Latin…

Etymology from Wiktionary, CC BY-SA 3.0