dix-huit
She has had the same boyfriend since she was eighteen.
Elle a le même petit ami depuis l’âge de dix-huit ans.
She came to Tokyo at the age of eighteen.
Elle est venue à Tokyo à l’âge de dix-huit ans.
When I was eighteen, that's when you should have known me!
Quand j’avais dix-huit ans, c’est là que tu aurais dû me connaître !
— Nights of Cabiria (1957)
Wimbledon has eighteen grass courts, including the Center Court.
Wimbledon compte dix-huit courts en gazon, dont le court central.
Now that you are eighteen, you can get a driver's license.
Maintenant que tu as dix-huit ans, tu peux obtenir ton permis de conduire.