Gareth Hopkins, 43, of Hoddesdon, Hertfordshire, was running on April 26 in memory of his late grandmother to raise money for the charity Age UK, but was taken to hospital at mile 25.
Elderly people are among those subjected to degrading treatment, with many left languishing on trolleys in urine-soaked bedding and no privacy, Age UK says.
While the number of older people continues to rise, Age UK said it is 'shameful' that pensioners are now spending a shorter amount of their retirement in good health.
Almost one in five - or 2.4 million - older people have limited use of the internet and use it less than once a month or not at all, according to Age UK.
EXCLUSIVE: Age UK, formerly known as Help The Aged, says it has made the 'hard decision' to look at selling its property known as Woodcot in Salcombe, Devon.