The last thing you ever want to do is extend the period of frailty and disability and make people unhealthy for a longer time period. So lifespan extension in and of itself should not be the goal of medicine, nor should it be the goal of public health, nor should it be the goal of aging science.

Once you avoid the things that accelerate aging like smoking, obesity, excessive alcohol consumption, and excessive sun exposure, you've done about as much as you can to influence your aging process.

We have grown accustomed to the wonders of clean water, indoor plumbing, laser surgery, genetic engineering, artificial joints, replacement body parts, and the much longer lives that accompany them. Yet we should remember that the vast majority of humans ever born died before the age of 10 from an infectious disease.

Ageing is very rare. We only see it in humans and laboratory animals and in zoo animals and in our pets. Basically, organisms that are protected from the external world. Once you create that protection, you live long enough to see ageing.

It was a huge shock. I've never had hair that short in my life! I think the rest of the cast and crew were mourning my haircut more than I was! But after a while, I felt liberated, I learned to embrace it.

Every spiritual tradition has this idea of death and resurrection. It's not unique to Christianity.

Military deployments have never been something to enjoy, but the consequence of the actions, the shared nature of the sacrifices, and the nobility of the cause are invigorating. To be clear, I'm not talking about the killing and the death; rather, the sense of purpose that pervades every action, reaction, and outcome.

My first job out of law school was representing people on death row in North Carolina, where I often saw the impact of hasty prosecutions.