He has the physique and energy of a man half his age.

他有着小他一半年纪的人的体格和精力。

《柯林斯英汉双解大词典》

He was a man of stupendous stamina and energy.

他是个有着一流耐力、精力充沛的人。

《柯林斯英汉双解大词典》

He was interested in everything around him, so he was full of energy and always looked like a young man.

他对周围的一切都很感兴趣，所以他总是精力充沛，看起来总是像个年轻人。

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He was in his time extremely well known, a celebrity recognized on the street, and throughout his life, he was a man of extraordinary energy and productivity, in part because he was a very serious cocaine addict.

弗洛伊德在世时，远近闻名，是个家喻户晓的名人，纵观他的一生，他还是一个精力充沛的高产学者，部分原因是，他是个十足的瘾君子。

耶鲁公开课 - 心理学导论课程节选

At this point, he and his partners, Energy XXI and the legendary Texas oil man Tex Moncrief, have pursued the Shallow Water Ultra Deep (SWUD) play in the Gulf of Mexico with a persistence that is something to behold.

FORBES: McMoRan's Moffett And Partners Refuse to Give Up at Davy Jones 1

If we look to the answer as to why, for so many years, we achieved so much, prospered as no other people on Earth, it was because here, in this land, we unleashed the energy and individual genius of man to a greater extent than has ever been done before.

CNN: Inaugural Address

It's possible that Benedict recognized all this and that it influenced his decision to resign in favor of a younger man with more energy to manage and reinvigorate such a huge institution.

WSJ: Review & Outlook: The Papacy After Benedict