Words for age in Celtic languages.

Proto-Celtic *aiwestom = age, lifetime, era
Old Irish (Goídelc) áes [aːi̯s] = age, years; stage, period; era; lifetime
Irish (Gaeilge) aois [iːʃ] = age, length of life; old age; period, era
Scottish Gaelic (Gàidhlig) aois [ɯːʃ] = age, old age, antiquity
Manx (Gaelg) eash = eon, age, century; oldness, old age
Proto-Brythonic *oɨs = age
Old Welsh oit = time, period
Welsh (Cymraeg) oed [oːɨ̯d / ɔi̯d] = time, period, space (of time); life-span; age
oes [ˈoes] = age, long indefinite period; century; time, day(s); epoch
Old Cornish huis= age
Cornish (Kernewek) oos / ooj = age, period, epoch, era
Old Breton oit = age
Middle Breton oet = age
Breton (Brezhoneg) oad = age

Etymology: from the Proto-Indo-European *h₂ey-w-es-to-, from *h₂ey- (age, eternity), which is also the root of the English words age and eon [source].

Words marked with a * are reconstructions.

Sources: Wiktionary, Am Faclair Beag,, Fockleyreen: Manx – English Dictionary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionnaire Favereau

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