Even if you're someone who manages to run regularly now, doing so when you're 80 may seem ambitious. Their calculations suggest a runner should actually only be around 40 per cent slower when they're 75 than they were at the age of 40. The factor for the age you're testing must be divided by the factor for your current age, then that number should be multiplied by your current time. And there is a steeper drop when someone reaches 80 – the fall in fitness between ages 80 and 90 is bigger than the entire period between 40 and 80. 'If you maintain a good level of exercise there’s no reason you shouldn’t be physically very capable until you’re 80.'

Source: Daily Mail October 16, 2018 12:25 UTC