I think it's reasonable to suppose that one could oscillate between being biologically 20 and biologically 25 indefinitely.

There is no difference between saving lives and extending lives, because in both cases we are giving people the chance of more life.

[Anti-aging therapies will] never be perfect, but we'll be able to fix the things that 200-year-olds die of before we have any 200-year-olds, and the same for 300 and 400 and so on.

I don't work on longevity, I work on keeping people healthy.

If you look at winners of the Nobel Prize in biology, you'll find a fair smattering of people who don't know how to work a pipette.

If changing our world is playing God, it is just one more way in which God made us in His image.

It's not just about life, of course; it's about healthy life. Getting frail and miserable and dependent is no fun, whether or not dying may be fun.