Young children are beginning their formal education sometimes as early as four years old.

幼儿有时早在四岁时就开始接受正规教育。

《牛津词典》

The demographics of the congregation were interesting. There were a lot of children of two, three or four years old, a sprinkling of slightly older ones and then the figures fall off a cliff.

天主教会的人口统计资料十分有意思，二、三、四岁的孩子居多，年纪稍大一点的也不算多，年龄更大些孩子的数字更是直线下降。

youdao

She used the royalties to purchase a run-down farmhouse in New Hampshire, where she raised four children without the aid of electricity or running water until her youngest child was five years old.

她用所获得的版税购置了一座位于新罕布什尔的古旧农舍，她在那里抚养四个孩子长大，直到她最小的孩子五岁之前农舍都无法使用电和自来水。

youdao

Experts at the Centers for Disease Control and Prevention say hospital treatment for likely H1N1 is most common among children up to four years old.

VOA: special.2009.11.24

Among New York City's homeless families are Yolanda Walker, 42 years old, and her four children, including a disabled daughter.

WSJ: Login/Register to set your edition

Mr. Ergen, 59 years old, says four of his five children have stopped paying for a TV subscription, and the fifth is living home.

WSJ: Dish Chief: TV Needs to Change

Each night, thousands of children, some only four or five years old, leave their villages and walk for miles to the safety of Gulu, the biggest town in northern Uganda.

NPR: Lost Generation Grows in Uganda