Nobel Prize-winning molecular biologist Venki Ramakrishnan sat down with ABC News Live to discuss the science and ethics of extending the human lifespan.
RAMAKRISHNAN: Well, I think a society where everybody lived indefinitely or very long time, say, hundreds of years would be a very different society. It would be quite stagnant. It'd be the same group of people just living longer and longer. ABC NEWS LIVE: Explain why it is that sometimes our biological age doesn't match our chronological age.
RAMAKRISHNAN: Yeah. So blood -- there are different markers for aging. So some markers are on our DNA. Our DNA acquires marks called epigenetic marks as we age. And that changes the pattern with which we express different genes.
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