Luka Modric - 39 - one of the best midfielders and important piece in UCL conquest
Thiago Silva - 39 - best defender that season
Pepe - 40 - important piece of international and national competitions
...
Sorry to pick you out among the Lebron lovers but it was easier. How many players under 35 are playing less well than they were? As js8 said, a few examples are outliers. The overwhelming majority are deteriorating before 35. So I dismiss those examples.
As for the lack of warning, what did you all expect? I've been pointing it out the last several seasons. You're not going to get warnings any more. It doesn't matter how big the change is, how massively it will change the economy of the game? None of that matters. All that matters is that there must be change. It doesn't matter if its good or bad, and it certainly doesn't matter if its ever been discussed or even thought through.
What a joke.