In my opinion the entire band still performs with great energy, considering their age. Many people who was in the same show as me said the same thing.It was one of the main comments after the show. This is also clear in all the videos I saw from the tour.
Bruce and Janick are unbelievable. Steve, although not as energetic as Bruce and Janick, is still running, jumping, headbanging and his playing (the most important thing) is still top notch. Dave and Adrian still their usual self. I can't see much difference between their performance on this tour and on the last one. Actually, I think they are showing more enthusiasm on this tour, this is noticeable mainly in Adrian's performance. Nicko is the one I'm most worried about, although he is still rocking those drums. It would be really sad, but I agree with those who said the band could go on if Nicko or one of the three guitarrists leave.