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It takes a lot of resources to climb Everest, and a lot of other people. But you should go do it.

I have climbed Everest from the Nepal route and the China route. The other routes are too hard for me. So I don't think I can climb Everest again.

If I know I make this much trouble, I never climb Everest.

I learned two basic lessons on Everest. First, just because something has worked in the past does not mean it will work today. Second, different challenges require different mindsets.

I like to think of Everest as a great mountaineering challenge, and when you've got people just streaming up the mountain - well, many of them are just climbing it to get their name in the paper, really.

I enjoyed climbing with other people, good friends, but I did quite a lot of solo climbing, too.

I never imagined I could make it to the top of Mount Everest at age 80. This is the world's best feeling, although I'm totally exhausted. Even at 80, I can still do quite well.

I realised I'd never climb Everest but thought I could still write a book.

To get ready to climb Everest, I did a lot of hill running with a daypack on and a lot of underwater swimming. I would swim a couple of lengths underwater and then a couple above. It gets your body going with limited oxygen.