Premier League players are playing for longer at the highest level and extending their peaks for more seasons than ever before. Whilst fixture congestion has become a major issue and one that former Liverpool manager Jurgen Klopp brought up numerous times during his time at Anfield, professionals in the game are now fitter than ever before, and as such, extending their playing careers. Last season alone saw the likes of former Red James Milner and Thiago Silva set numerous records for their achievements of playing in the Premier League at the ages of 38 and 40 respectively, with the pair key f…