Words for age and related words in Celtic languages.

Dinas Bran

Proto-Celtic *aiwestom = age, lifetime, era
Old Irish (Goídelc) áes [aːi̯s] = age, years, stage, period, era, lifetime
áesmar [ˈaːi̯sṽər] = aged, long-lived
Irish (Gaeilge) aois [iːʃ/ɯːʃ] = age, length of life, old age, period, era, century
aosaigh = age, come of age
aosánach = youth, youngster
aosántacht = youthfulness
aosta = aged, old
aostach = old person
aostacht = oldness, old age
Scottish Gaelic (Gàidhlig) aois [ɯːʃ] = age, old age, span of years
aosta [ɯːsdə] = elderly, old, aged
aosmhorach = aged, ancient
aosmhorachd = antiquity, agedness
aosmhor = elderly, aged, old, ancient
co-aois = (age) peer, contemporary
Manx (Gaelg) eash = eon, age, century, oldness, old age, seniority
eashagh = oldish
eashit = aged, grown-up, oldish
çheer-oayllee = geographer
çheer-oaylleeaght = geography
çheer vooar = mainland
çheer yalloo = landscape
Çheer ny Aeg = (mythical) Land of Youth
Proto-Brythonic *oɨs = age
Old Welsh ois = age
oit = time, period
Middle Welsh (Kymraec) oes = age
oet = time, period
Welsh (Cymraeg) oes [oːɨ̯s/ɔi̯s] = age, long indefinite period, century, age, time, day(s), life, lifespan, lifetime
oesaf, oesi = to live, lead a life, spend a life, exist, survive
oesfyr = having a short life, short-lived, ephemeral
oed = time, period, space (of time), duration of life, life-span, age
oed(i)af, oedi(o) = to delay, procrastinate, linger, loiter, dally, dawdle, idle
oed(i)og = old, aged, ancient, long-lived, long-lasting, suspended, delayed, slow, leisurely, dilatory, adult
oedolyn = adult
Old Cornish huis = age, process of time, a period of time
Middle Cornish (Cernewec) oys, oydge, uz, oge, ooz = age, process of time, a period of time
Cornish (Kernewek) oos / ooj = age, epoch, era, period
oos an rew, oos an yey = ice age
Middle Breton (Brezonec) oed =
Breton (Brezhoneg) oad = age
oadour = (an) adult
oadourel = adult

Etymology: possibly from the Proto-Indo-European *h₂eyw-es-to-, from *h₂eyu- (age, eternity), from *h₂ey- (vital force, life, age, eternity) [source].

Words from the same PIE roots include age, eon, eternal, ever, juvenile, medieval and young in English; and eeuw (century, many years, a very long time, eternity) in Dutch [source].

See also: Words for old

Sources: Wiktionary, Am Faclair Beag, Online Manx Dictionary,, eDIL – Electronic Dictionary of the Irish Language, In Dúil Bélrai English – Old Irish glossary, Geiriadur Prifysgol Cymru, Gerlyver Kernewek, Dictionaire Favereau, TermOfis, English – ProtoCeltic WordList (PDF), Etymological Dictionary Of Proto Celtic

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