He's an elderly gentleman.

他是位年长的绅士。

The elderly gentleman.

这位老先生。

I have always been admired this elderly gentleman.

一直以来，我都非常崇仰这位老先生。

I have always been admired this elderly gentleman.

以来，我都非常崇仰这位老先生。

He is an elderly gentleman who had had a cataract operation.

他是一位曾经动过白内障手术的老人。