The age of the earth is reckoned at about 4 600 million years.

估计地球的年龄大约为46亿年。

《牛津词典》

The professor theorized about the age of the earth.

教授从理论上推测了地球的年龄。

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The age of the Earth is central to that question, and it has been taken on by human cultures for millennia.

地球的年龄是这个问题的中心，已经被人类文化承载了几千年。

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Not until the nineteen fifties did scientists, using radioactive dating, place the age of the Earth at over four billion years.

VOA: special.2009.12.01

Also,in Darwin's time, the age of the Earth was estimated only in the millions of years too short a time some said for evolution to work.

VOA: special.2009.12.01

The University of Virginia professor even thought that this warming was so great that it helped the earth avoid another ice age.

VOA: special.2011.04.26

Note that the above years have been computed up to 4.5 billion years due to the scientists suggest the age of the earth to be that.

FORBES: Young Earth Creationists Whipsawed By IRS

The two strands of the narrative converge when the connections between them (such as the implications of geology for the age of the earth and the origin of species) intensify.

ECONOMIST: History of science: Time's arrow | The

The long-lifers' heroes are the likes of John Glenn, who circled the earth at the age of 77, and Goya, who was still painting rather well at 80.

ECONOMIST: George Dawson