他现在九十多岁了。

He is ___in ___his ___nineties now.

我的祖母身体非常健康，尽管她已经九十多岁了。

My grandmother is in excellent health, even though she's ___in ___her ___nineties.

这位退休教授在九十多岁时仍在著书。

The retired professor is still writing books ___in ___his ___nineties.