He got banged up early in the year and I do wonder if he has been playing with injuries this year. No doubt his age will eventually catch up to him but I do wonder how much the injuries have impacted him this year.
I think it's that knee he hurt the last week of training camp.
Last night early on Mahomes threw that corner route over his head in the end zone. The camera showed Kelce walking off raising his hand (to come out of the game), and he was grabbing at that right knee.
He came back in later but my money is on that knee and possible surgery in the offseason.