He cannot be under thirty years of age.

他的年龄不会小于三十岁。

youdao

All men and women under thirty years of age are cordially invited to enter the competition.

诚请未满三十岁之青年男女报名参加。

youdao

He was now, as we have said, three-and-thirty years of age, and his fourteen years' imprisonment had produced a great transformation in his appearance.

我已说过，他现在已经三十三岁了，十四年的牢狱生活已在他的脸上发生了气质上的变化。

youdao

He retired from that part of his life ten years ago, at the age of thirty-one.

VOA: special.2009.09.11

Inge Morath Award An annual award for a woman photographer under thirty years of age to assist in the completion of a long-term documentary project.

BBC: The business of photojournalism

Besides Matron, there were three other registered nurses, not one of them within thirty years of my age.

NEWYORKER: Amundsen

We are currently between thirty and fifty years of age, and there are 84 million of us in the United States.

FORBES: The Challenges Facing Gen X Women