同类词: seventy， eighty...

She's in her mid-thirties—thirty-six to be exact.

她三十五岁左右—确切地说是三十六岁。

He was struck down by cancer at the age of thirty.

他三十岁那年被癌症夺去了性命。

He died seventy years ago.

他70年前就死了。

I hope I am still healthy when I am in my seventies.

我希望自己七十多的时候依然健康。