Longevity ? Thomas Tuchel: “I think it gets more and more difficult in today's game, Cristiano took a step into a league which is not as competitive as the Premier League or Spain - where he played before - as part of keeping his performance up. I think he is always the exception to the rule, we cannot go now from Cristiano Ronaldo and think everyone can play until 39 and 40 in today’s game.”