My sister-in-law is a healthy 30 yr old woman who just completed her first marathon 2 weeks ago and she amazes me (granted she trained for it and did it somewhere between 2 jobs, her last yr as a Psych PhD, my brother owning a gym and working 4x10 hrs/week as a head security / sys admin for a major telecom company and they have 2 hyper dogs who need to be fed & let out 3x/day).
But this guy and his son and their family are a testament to the power of the human spirit & body.