You should say:

　　Who the person is

　　What field the person is expert at

　　What interesting thing has happed to this person

　　参考范文：一个学多才多艺的老爷爷

　　Well, I’m going to talk about one of my grandfather’s friends, Mr. Zhao. He’s in his mid-70s already, but he doesn’t seem that old at all. He is still quite energetic every single day.

　　I got to know Mr. Zhao when I was a child. I was about 5 or 6 years old then, if I remember correctly. At that time, he often came over to my apartment and hung out with my granddad. They would then go fishing together, or go to the park to play chess. They were really inseparable.

　　Anyway, in terms of what Mr. Zhao is like ...well, I think the best word to describe him would be multi-talented. He’s good at so many things, like fishing and chess, as I said just now. Plus, he can also play various kinds of musical instruments, such as the violin, the piano and the guitar. Oh, I shouldn’t forget to mention that he’s pretty knowledgeable too. He’s really a walking encyclopedia.

　　Well, I really admire him mainly because he’s so versatile. I haven’t seem many other people whodo well in so many areas. Also, as I mentioned earlier, he’s pretty well-read. You know, I like reading too and I want to be someone who reads as much as he does. So yeah, I really look up to him.