Ageing has arguably always been a puzzle. There is the 82-year-old part-time farmer down the road who remains light on his feet, while his 60-something accountant neighbour gets short of breath walking from car to office. According ‍to a team of scientists at Vanderbilt University in the US state of Tennessee, “superagers” such as the farmer could have an innate advantage over the prematurely old, at least when it comes to cognition. According to the university, those in their 80s with brain…