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The length of time that a person, animal, or thing has existed; the time of life of a person or thing.
Elle a atteint l'âge de la retraite.
She has reached retirement age.
L'âge moyen des participants était de 30 ans.
The average age of the participants was 30.
In French, 'âge' is always used with a determiner (e.g., 'un âge', 'l'âge').
'Âge' always requires a determiner in French (e.g., 'un âge', 'l'âge').
'Âge' is masculine and singular. It does not change form for plural.
From Old French 'aage', from Latin 'aetatem' (nominative 'aetas'), meaning 'age, lifetime'.
'Âge' is used both for chronological age and for stages of life. It is often used with 'de' to specify a particular age (e.g., 'à l'âge de 10 ans').