Question

我母亲和他母亲一样苍老翻译成英语

Answer 1

as old as有两层意思,一是一样苍老,二是同龄.

如果要区分,建议翻译成：

My mother looks as old as his mother.

Or

My mother and his mother are both old and grey.

上面的加了just非常好.