We are in 2024 and at this time Cristiano Ronaldo will be 39 years old and in 2026 he will be 41, performance wise there will not be much difference between 39 years and 41 years. So if the performance he is doing now is right for the team, then he can definitely represent for the 2026 World Cup team.
What makes Ronaldo special and different from other players is that Ronaldo is really hardworking and very consistent. There are not many players with that kind of determination. So I think Ronaldo will still be called up to the 2026 World Cup and will probably be one of the oldest strikers to appear at the 2026 World Cup. Even though his performance is no longer the same as in his prime, Ronaldo is the same as Messi. They can make a difference and improve the morale of other young players. I still remember when Ronaldo encouraged Joao Felix when he was about to take a penalty at Euro 2016 and that really boosted Joao Felix's morale so he could take the penalty with confidence.
Not that stars like Messi and Ronaldo always have to perform at their best, but when they are with the team, the team gets a different courage and the team players are more active. Other young players can't finish like Messi and Ronaldo, and they can play under pressure but other players can't. So I think even if Cristiano Ronaldo is 41 years old, he will play the 2026 World Cup.