Working as a guide makes you worry a bit about age and health. I need another 20 years service from these knees! Roger Federer was described on the radio yesterday as "maybe too old" when he lost a tennis match, aged 34...
A quick glance back through the photo album provides some inspiration and reassurance. Fair enough, you need a bit of luck with injury avoidance and genetics, but here are some of the keenest, most enthusiastic people I've been out with recently - all in their 70's...
And Rupert was just starting out on his epic summer. More here:
http://swiss-perimeter.ch/?page_id=10&lang=en