He was seven years old, small and fine-boned like his mother.

他七岁岁，骨架像他妈妈一样小而匀称。

《柯林斯英汉双解大词典》

When Yang Liu was seven years old, she started practicing single bamboo drifting with her grandmother.

当杨柳7岁的时候，她开始和奶奶练习独竹漂。

youdao

At the same time, from a recent study, many children have missed out on 4,500 hours of sleep by the time they are seven years old.

同时，最近一项研究显示，许多儿童到7岁时已少睡了4500个小时。

youdao

From that time until she was almost seven years old, Helen could communicate only by making signs with her hands.

VOA: special.2009.11.08

Well, I started playing baseball when I was really young, about...I think I was seven years old,

我很小的时候就开始打棒球了，大概是……，我想那时候我大概七岁吧，

会打棒球吗？ - SpeakingMax英语口语达人

Milton has just returned home after seven years at the university, a university education so generously financed by his father who was actually now 70 years old, and John Milton, Jr.

弥尔顿在7年的大学学习结束之后回到家中，他父亲如此慷慨的资助他完成了学业,而此时弥尔顿的父亲已经70岁了。

耶鲁公开课 - 弥尔顿课程节选

She was fifty-seven years old and had joined the clinic after suffering a third heart attack.

NEWYORKER: The Hot Spotters

She's finally coming home, at sixty-seven years old, after an absence of nearly fifty years.

NPR: Excerpt: 'The Sister'

This is weird because it began airing in 1988 when I was seven years old.

FORBES: Watching 'The Wonder Years' on Amazon