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

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

I'm the chief science officer of a foundation that works on the application of regenerative medicine to the problem of aging.

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

Some things tend not to work so well for science - things that rely on substantial written contributions by key experts are a case in point - but even there I tend to keep an open mind, because it may just be a case of finding the right formula.

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

Ageing is, simply and clearly, the accumulation of damage in the body. That's all that ageing is.