While you are in the prime of life, why not devote yourselves to a special field of study?

为什么不把握人生中最美好的时间，努力做一种专门学问呢？

youdao

He was barely 30 and in the prime of (his) life.

他还不满30岁，正是英姿勃发的年华。

《牛津词典》

As youth, we are in the prime of our life. We should make good use of our golden time.

作为青年，我们正在生命兴旺时期，应该好好利用我们的黄金时代。

youdao

In a VOA interview, Hailu admitted that many opposition supporters are suspicious of his seeming closeness and conciliatory attitude toward Prime Minister Meles, whose government convicted him of treason and sentenced him to life in prison three years ago.

VOA: standard.2009.11.01

Seau, like others, was in what non-super athletes call the prime of life (43 years old), on the cusp of prime time earning potential.

FORBES: Connect

But a commercial aircraft that is 15 years old is still in its prime of life.

ECONOMIST: Aircraft fatigue

It can strike in the prime of life and is one of the few cancers whose incidence is exploding, for unclear reasons.

FORBES: Targeting Melanoma