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Since he is 31 years old, I think he can perform at a high level for 3 more years. Casemiro is a player whose style I like and he is one of the few players in the Manchester United squad who does his job well. He has a structure that gathers the midfield. The Saudis spend incredible amounts of money to recruit famous players, but if you ask whether Manchester United will sell him, I think not. Casemiro will be an important dynamo as we go through the recovery process.
Casemiro with his current level of play and fitness is indeed plausible that he is able to continue his contribution at a high level for three more years. He is certainly the most important player for Manchester United, even though we dont see his best performance like he used to perform at Madrid, his impact to the team is so significant. His ability to gather and control the midfield not only showcases his individual skills but also show his importance in the overall team dynamics.
Manchester United being reluctance to sell Casemiro is reasonable with the sentiment that players of his caliber. He is invaluable asset who consistently delivers and fulfills his role effectively. Manchester United as a club, especially during a recovery or rebuilding phase, would likely prioritize retaining such key players who provide stability and leadership. His experience, work ethic, and on-field contributions can serve as a stabilizing force during transitional phases.
We can't be sure about his fitness yet but I can say Casemiro is still at a level in which he can play for more years in top-level teams like Manchester United without problems, however, I think Manchester United should keep Casemiro but even if they don't want to have this palyer any more I think Casemiro can choose to stay in another team in the Euroa which there are obviously many offers for this palyer.
But moving to the Saudi countries is just too soon for a player like Casemiro who can play at this level for his team.