这个老爷爷今年七十岁了。

The old man is ___seventy years old this year.

我奶奶今年七十岁了，但她仍然喜欢去公园散步。

My grandmother is ___seventy years old, but she still enjoys walking in the park.

我父母在七十年代相识。

My parents met in the ___seventies.