Mahomes is the prospective G.O.A.T. he has to maintain it.
That is largely up to the Chiefs.
Bill Belichick was 48 years old when he and Tom Brady first came together for their 20 year run.
Andy Reid was almost 60 when he and Mahomes came together, so it will be incumbent on the Chiefs at some point to maintain the right structure and culture around him to maintain it.