The reasons behind older athletes' Glasgow success
29 July 2014 Last updated at 13:08 BST
The 2014 Commonwealth Games in Glasgow has seen a flurry of older competitors winning medals.
Notably, 60-year-old pistol shooter Mick Gault came out of retirement to take bronze in the men's 10m Air Pistol event.
Dr Melanie Lang, an expert on the sociology of youth sports, told BBC Radio 4's Today programme that athletes do not need to begin training at a young age in order to compete at the top of their sport.
Dr Graeme Close from Liverpool John Moores University added that his research shows the muscles of 70-year-old cyclists can appear similar to those of a 20-year-old if consistent training is maintained.
First broadcast on BBC Radio 4's Today programme on Tuesday 29 July.