She is small for her age.

相对她的年龄而言，她个子小了。

《柯林斯英汉双解大词典》

She learned to play the instrument when she was a small child and gave her first public recital at age 9.

当她还是个小孩子的时候，就学会了演奏乐器，并在9岁时举行了她的第一次公开独奏会。

youdao

When he grew older, William Smith taught himself surveying from books he bought with his small savings, and at the age of eighteen he was apprenticed to a surveyor of the local parish.

当威廉·史密斯长大一些，他用自己的一点积蓄买了一些书，自学测量学，并且他18岁时在当地教区做了一名测量师的学徒。

youdao

But the increased risk is small. Only five percent of the increased risk is attributed to maternal age.

VOA: standard.2010.02.10

Another reason for a new golden age of small companies is that size and incumbency breed inertia, faster than ever--even in the best of companies.

FORBES: Three Trends for 2005

Watching more than three hours' TV a day at this age predicted a very small increase in "conduct" problems at the age of seven.

BBC: TV time 'does not breed badly behaved children'

The aim of the joint effort is to link 100, 000 Americans over age 50 with small business development resources, including workshops, conferences and mentoring programs.

FORBES: Are Senior Start-Ups The Answer?