His sister was five years younger.

他的妹妹比他小五岁。

youdao

I was five when I began counting down the years until my sister would move out.

我从五岁起，就开始倒数计时看我姐姐将何时离开家搬出去住。

youdao

She has two American-born sons who are five and seven years old, and who are staying with her sister in the United States.

VOA: standard.2010.06.07

The researchers said the probability of the younger sister having a teenage pregnancy went from one in five to two in five if the elder sister had a baby as a teenager.

BBC: Teenage pregnancy is 'contagious'

Ms. Simpson owns five bulls with her sister, Teresa Workman, 47, a programmer for the state.

WSJ: This Ain't No Bull: Nary a Cowboy Can Ride 'Em These Days

Both it and its digital sister station Five Live Sports Extra had an audience of 6.15 million, compared with 6.27 million for Five Live alone the previous year.

BBC: NEWS | Entertainment | Wogan show boost for BBC Radio 2