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1·Ten year-olds are incredibly energetic.

10岁的孩子精力非常旺盛。《柯林斯英汉双解大词典》

2·The teachers say the tests for 14-year-olds are misconceived.

老师们说这些测试不适合14岁的孩子。《柯林斯英汉双解大词典》

3·A high proportion of five-year-olds have teeth in poor condition.

五岁儿童牙齿不健康的比例高。《牛津词典》

4·Up to two thirds of 14 to 16 year olds admit to buying alcohol illegally.

14至16岁的少年中有多达2/3的少年承认非法买过酒。《柯林斯英汉双解大词典》

5·Their range of leisurewear is aimed at fashion-conscious 13 to 25 year-olds.

他们的休闲服系列瞄准的是关注时尚的13到25岁的人群。《柯林斯英汉双解大词典》

6·The state should move toward the goal of preschool for all 3- and 4-year-olds.

国家应朝着为所有三到四岁儿童开办学前学校的目标努力。《柯林斯英汉双解大词典》

7·In the first study, three-year-olds watch two videos shown side by side.

在第一项研究中，三岁的孩子们观看了并排播放的两段视频。

8·Telling such stories to two year olds does not seem to produce long-lasting verbalizable memories.

给两岁的孩子讲这些故事似乎并不能使他们形成可以用语言表达的持久性记忆。

9·Verbal abilities of one year olds are, in fact, related to their memories for events one year later.

事实上，一岁大的孩子的语言能力与他们对一年后发生的事情的记忆有关。

10·Finland provides three years of maternity leave and subsidized day care to parents, and preschool for all five-year-olds.

芬兰为父母提供3年的产假和日托补贴，并为所有5岁儿童提供学前教育。

(1)of old古时的；从前

(1)years old…岁（年龄）

(1)old man情人；丈夫；老头子；父亲

(1)old age老年；晚年

(1)young and old老老少少

(1)old people老年人；老人