The enjoyment of life would be instantly gone if you removed the possibility of doing something.

Follow the path of the unsafe, independent thinker. Expose your ideas to the dangers of controversy. Speak your mind and fear less the label of 'crackpot' than the stigma of conformity. And on issues that seem important to you, stand up and be counted at any cost.

I think it's very important to have a public discussion about why we're denying our soldiers the ability to exercise their Second Amendment rights.

Every January we see these fad diets promoted. These aren't promoting healthiness, these aren't promoting a way of embracing exercise and eating fruit and veg and doing things which will actually help people.

Obviously, I come from one background, and the people that design fitness equipment have been doing it for years and years, and they know what works and doesn't work.

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.