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

The twins are five years old, and their elder sister is eight.

两个双胞胎今年五岁，他们的姐姐今年八岁。

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

Doug Springsteen grew up shadowed by the death of his five-year-old sister, Virginia, who was hit by a truck while riding a tricycle, in Freehold in 1927.

NEWYORKER: We Are Alive

Their five-year-old sister was also taken ill.

BBC: Farm defends response to E.coli

The baby, thought to be due in November, will provide her five-year-old son Cameron with a brother or sister.

BBC: Ulrika Jonsson pregnant