He was barely 20 years old and already running his own company.

他只有20岁，却已经营起自己的公司了。

《牛津词典》

After all, who in his right mind would seek a lousy old patent offering a mere 20 years of protection when copyright can provide monopoly rights for up to 70 years after the author's death?

毕竟著作权可在作者去世后提供多达70年的保护，只要是脑筋正常的人会舍此而追求糟糕的旧专利提供仅仅20年的保护嘛？

youdao

Instead, 28 years later, a series of 36 photographs taken in 1980 by his fellow student Lisa Jack gives a sense of the 20-year-old Barry Obama in search of self.

事与愿违，28年后，他的同学丽莎·杰克在1980年所照的一套36张的照片，让我们感受到了一个寻找自我的20岁的贝里·奥巴马。

youdao

Mr. Lanza, 20 years old, started his rampage on Dec. 14 by shooting his 52-year-old mother, Nancy Lanza, with a .22-caliber rifle while she lay in bed, according to Stephen Sedensky, the state's attorney for Connecticut who is leading the investigation.

WSJ: Arsenal Found in Newtown Gunman's Home

James Brodie, from Bulwell, was 20 years old at the time of his disappearance.

BBC: Farmland search over Marian Bates murder in 2003

The 20-year-old emigrated with his family from Halifax four years ago and came through the Storm junior ranks.

BBC: Gareth Widdop in Storm squad for World Club Challenge