I think 38 is not a negative for Cristiano. We watched Zlatan again with his good performance at this age. Ronaldo can show this performance in the same way. It just takes a team that believes in it. He was 37 years old last year and had done well for Manchester United. Cristiano Ronaldo probably plans to play football until the age of 40. Later, he can step into his coaching career.
Ronaldo has already said that he believes that 40 years is a good age to retire. I think that this can be regarded as a direct confirmation that he will not end his career earlier.
As for his possible coaching career, I'm not sure about that. He is too ambitious and demanding of himself - if he makes at least 20% of such demands on ordinary players, then this will lead to nothing but conflicts.
In fact, I see the opposite, a coach must have the characteristics that Cristiano Ronaldo has, hard work, ambition and do his best. He has a very good mentality, so he can apply that to his players at the club later. He has always been someone who motivates other players where he is, that can be seen now with so many young players who are motivated by him. This is a good capital to continue his career as a football coach.
It will be his decision whether he wants to be a coach or not in football after he retires. But to be honest, I want to see when he becomes a coach, will he have the same success as a player or not.