走进酒店的那个老头子已经90岁了。 That (old) gaffer going into the pub is 90 years old.
有个老头向儿童裸露性器官而遭逮捕。 An old man was arrested for exposing himself to young children.
那个顽固老头就是不肯进医院。 The obstinate old man refused to go to hospital.
我称他是个古怪的老头。 I call him an antic old man.
看来那老头打动了你的心，你就给他一些钱。他真聪明，晓得怎样编造故事来博取别人的同情。 So the old fellow got round you and you gave him some money. He's clever, and he knows how to tell the tale.