But at that time he was still under 30 years old, in terms of stamina, it was a moment where cr7's stamina was still very fit, it would not be the same as 37 years now. 2011 and above was CR7's peak performance so I'm not surprised to see his achievements with mourinho. I feel he is not suitable for Serie A, previously he play for Juventus in Serie A but the results are still not as expected, yes maybe age is a factor cr7
Football nowadays is different than ten or twenty years ago. Even strikers and attacking players have to proactively contribute to defense. It is what Ronaldo does not have.
I don't say Ronaldo is worse than any strikers at his age. He even scores more goals than many young attacking players. The minus point for any club has Ronaldo in their squad is they will have to cover his lack of defense contribution. If they can build up a system for it, they can use Ronaldo. If they can not, they will have troubles and lose in big clashes.
In reality, to have good result after final whistle, a club need both, good defense and good attacking, a sort of balance between defense and attacking. It is not what Manchester United have now.