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If there's the 4th meeting between these 2, GGG might be around 42-43 years old by that time.
OK.. so you are saying that in case Canelo loses this fight, he will wait for another 3 years to face Golovkin again? GGG is 40 years now. If there is a 4th fight, that should happen in 2023. By that time, Golovkin will be 41, and not 43. But it is entirely another story if Canelo avoids fighting him (as happened after the second fight). Anyway, Canelo has other commitments as well. He is planning to take on Bivol sometime soon. It may happen by end of this year, or by Q1 next year, if he scores a KO victory over Golovkin.
That was just a wild guess, bro. In the very first place, Canelo didn't even prioritize having a trilogy that's why long talks again might happen. Although that might be changed if GGG will win against him on their 3rd meetup.
If ever Canelo will lose against GGG, I'm sure Canelo will still follow his original roadmap and might take 2-3 fights before considering having the 4th match with GGG. If Canelo will average 1 fight per year, which is just a sample figure since usually, the average is about 2, 2-3 fights might end in 2-3 years and GGG will be around 42-43 years old. Organizing a fight, especially a big one is not that simple to arrange and we should consider that thing as one of the reasons for a long negotiation.
Anyways, this is just speculation. GGG even needs to win first for a possible 4th bout in the future against Canelo.