When you get older, if you are healthy, is not a problem. If you don't have the health, then you go home.
Rafael NadalFor sure, with golf it's not a physically demanding sport like tennis. That's what makes tennis great - you combine both things. It's a very mental sport and at the same time can be dramatically physical. But I do admire the mentality of sport more than the physicality because physical performance is much easier to practice than mental performance.
Rafael Nadal