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I mean, don't forget the earth's about five thousand million years old, at least. Who can afford to live in the past?

Immortality may be impossible, but imagine what humanity could learn if we all lived 700 years. We could travel deep into utopia and beyond.

If you want to live a hundred years, how do you want to live your life? At the age of 100, you should go shopping with your great-grandchildren, but not in a wheelchair.

My only wish would be to have 10 more lives to live on this planet. If that were possible, I'd spend one lifetime each in embryology, genetics, physics, astronomy and geology. The other lifetimes would be as a pianist, backwoodsman, tennis player, or writer for the 'National Geographic.'

I'm getting better, happier, and nicer as I grow older, so I would be terrific in a couple of hundred years time.

I would like to go back and spend a Christmas with my family and myself when I was five years old and just see what that dynamic would be like. Observe it. I think it would be a magical gift.

I suspect if people live a lot longer they would be retired for a somewhat longer period of time. Just the financial planning takes on a very different character.

My grandfather would live to see his children become doctors and ministers, accounts and professors.

The future that I will not live to see is the one my children will live in. That's my immortality. And I shouldn't try to mortgage theirs for my benefit.

Great wealth could make an enormous difference over the next decade if they sensibly support the scientific elite. Just the elite. Because the elite makes most of the progress. You should worry about people who produce really novel inventions, not pedantic hacks.