fifty · number /ˈfɪf.ti/Full view
fifty
A2 the number 50
Dictionary examples:

forty, fifty, sixty

They were traveling at fifty miles an hour.

Learner example:

There were fifty guests at my party. (Key English Test; A2; Russian)

(be) in your fifties/50s
B2 to be aged between 50 and 59
Dictionary example:

He retired when he was still in his fifties.

Learner example:

Despite being in my fifties I am healthy and in good shape. (First Certificate in English; B2; Polish)

the fifties/'50s
B2 the years 1950 through 1959
Dictionary example:

Many new suburbs were built in the fifties.

Learner example:

I love bands from the fifties, sixties, seventies . . . and most of the radio stations seem to forget that the music has a history and it is always nice to remember past songs, because a good song will always be a good song. (First Certificate in English; B2; Spanish)

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