"Always plan ahead. My schedule book is already full until 2014, with lectures and my usual hospital work. In 2016 I'll have some fun, though: I plan to attend the Tokyo Olympics!
There is no need to ever retire, but if one must, it should be a lot later than 65. The current retirement age was set at 65 half a century ago, when the average life-expectancy in Japan was 68 years and only 125 Japanese were over 100 years old. Today, Japanese women live to be around 86 and men 80, and we have 36,000 centenarians in our country. In 20 years we will have about 50,000 people over the age of 100.
Share what you know. I give 150 lectures a year, some for 100 elementary-school children, others for 4,500 business people. I usually speak for 60 to 90 minutes, standing, to stay strong."