Number + 年代
年代 (niándài) means 'decade,' 'era,' or 'period' and is used to refer to a span of years, often in historical or cultural contexts. It follows a number to indicate a specific decade. For example, 八十年代 means 'the 1980s.'
九十年代的流行音乐特别好听。
jiǔshí niándài de liúxíng yīnyuè tèbié hǎotīng.
The pop music of the nineties was especially pleasant to listen to.
那是一个充满变化的年代。
nà shì yī gè chōngmǎn biànhuà de niándài.
That was an era full of changes.
他出生在七十年代末。
tā chūshēng zài qīshí niándài mò.
He was born in the late seventies.