For more information, check out the long version of the video.
In 1978, Ernst Erb (at the time 41) was diagnosed with an incurable Mantle Cell Lymphoma and given a statistical life expectancy of 2½ years. On his eightieth birthday (2016), he walked in one day from the Lucerne train station to Zurich Central Station — 55 km in total.
Eating a whole foods vegan diet and getting enough physical activity can help you do amazing things, despite age or other lifestyle choices.
Nevertheless, it is of the utmost importance that your vegan diet is a healthy one. Read more about how to avoid "vegan junk food" and what are the mistakes vegans often make, in the article "A Vegan Diet Can Be Unhealthy. Nutrition Mistakes".