ten years and a half vs ten and a half years

Both "ten years and a half" and "ten and a half years" are correct, but the more common and natural way to express this duration is "ten and a half years." It is frequently used in English and the more idiomatic choice.

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Last updated: March 17, 2025 • 5606 views

This phrase is correct but less common and less idiomatic than the alternative.

"ten years and a half"

This phrase is used to express a duration of ten years and six months.

Show examples from the web [+]

Some of my favorite examples: in transportation, . Ten years old, three and a half million people have joined up, and a million rides are shared every day.
They will double over the next ten years, and half these resources will be dedicated to Africa.
A ten-year-old, half-broken, good provenance.
It was great to be home... after ten and a half years abroad.
Over the past ten years, more than half of the bigeye caught has been below the legal size of 3.2 kg, despite the fact that vessels are only supposed to have 15% of their catch below this size.
Mr President, Madam President-in-Office, Commissioner, ladies and gentlemen, ten and a half years ago, the Chernobyl nuclear reactor disaster signalled the end of Communism and the beginning of perestroika.
Ten years ago, I was an inch-and-a-half shorter than I am today.
Our story begins 13 and a half years ago, when Jane Gloriana Villanueva was a mere ten years old.
Zuma Beach is on high alert, as a ten-year-old boy is trapped one and a half stories below the earth's surface.
The findings of this research which took place in the North Atlantic over a ten-year period show that carbon dioxide absorption by the oceans fell by a half up to 2005.
You will see a film made ten years ago; a shred of a film; a two and a half hour story, one-fifth of which is missing.
People don't see me as this pathetic blonde who peaked in high school... and is so desperate to recapture her past glory... that she moved the ten-year reunion up by three and a half years?
It is ten years last week since the appalling disaster of the sinking of the Herald of Free Enterprise at Zeebrugge, and it is three-and-a-half years since the Estonia went down with a loss of over 950 lives.
We consider, following a number of international works, that, if the billion or billion and a half people on Earth who have no access to water are to have access to it in the next ten years, we will need private funding.
In Parliament, for over a year and a half, various solutions were considered by at least ten parliamentary committees in order to make the text more consensual.
He returned after ten years and...
At the same time, liability is statute barred after ten years and capped at EUR 75 million.
For ten years and a day you have searched.
Ten years and no agreement must be a failure by any measurement you wish to adopt.
Ten years and then I take what's mine.

Alternatives:

ten and a half years
ten and one-half years

This phrase is the more common and idiomatic way to express a duration of ten years and six months.

"ten and a half years"

This phrase is widely used to indicate a period of ten years and six months.

Show examples from the web [+]

Mr President, Madam President-in-Office, Commissioner, ladies and gentlemen, ten and a half years ago, the Chernobyl nuclear reactor disaster signalled the end of Communism and the beginning of perestroika.
It was great to be home... after ten and a half years abroad.
1. The contact points of the Network shall meet no less of ten than once each half year, in accordance with Article 12.
Our story begins 13 and a half years ago, when Jane Gloriana Villanueva was a mere ten years old.
For four and a half years I lived with this woman.
I've been sober for 11 and a half years.
We were together four and a half years.
He has nine and a half years to go.
I have an old - four and a half years old - mobile telephone.
Mr President, Álvaro Uribe was elected two and a half years ago.
That still leaves six and a half years.
Since its inception it was not convened until the present Government came to power, one and a half years ago.
Their members shall be elected during the first part-session following the re-election of Parliament and again two and a half years thereafter.
I spent two and a half years down there.
Former presidential candidate Aliaksandr Kazulin had been sentence to five and a half years in prison.
By historical standards two and a half years is a short time.
I mean, you nursed Isabella for two and a half years.
I was counting on those three and a half years... to maybe invent something, become an overnight success.
The two-and-a-half years we spent together.
Gray hasn't worked for two-and-a-half years.

Alternatives:

ten years and a half
ten and one-half years

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ten years and a half vs ten and a half years

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