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I can't Really tell when Ronaldo will retire but it seems anytime soon. I'm sure Ronaldo won't play Champions league again till he retires, that's is why he was looking for a way to leave Manchester United because he knew this Champions league is just the last chance for him and never wanted to miss it . Age is really affecting Ronaldo's right now, because he is not too much active the way he used to be. If I can remember Ronaldo have only scored 1 goal for Manchester United in Europa League this season.
This time I don't agree with you, Ronaldo still has a chance to play in the Champions League. Ronaldo contract with Manchester United is almost complete, after which Ronaldo will be on a free transfer. Big teams in Europe don't mind hosting Ronaldo because they can get Ronaldo services for free. Even though Ronaldo is absent in the Champions League, he still has the opportunity to play in the most elite League on the European continent because his charm is still able to attract big teams when he is on a free transfer.
After all, before his contract runs out and if there is a team that is interested in signing him, then his signing can happen or can be done in the next transfer window in January. For some reason I feel maybe Ronaldo will move clubs in the next transfer window, because basically Chelsea with their new boss previously wanted to sign Ronaldo but the previous coach Tuchel had no interest in including Ronaldo in his plans. Now that Tuchel has been sacked, so it's very likely Todd Boehly will finally bring Ronaldo to Chelsea, if that happens then it might be the last team Ronaldo can play in the Champions League.