He just had his most productive season point-wise since 2010 (12 years ago)... and you're NOW worried that he doesn't train enough to avoid father time?
Also, his PHD dissertation is
literally about comparing training methods between Russia and North America.
His extremely solid track record at longevity and reinventing himself, his resistance to injuries, his genetic makeup (two athlete parents), his love for the game, etc. don't really have me worried for him experiencing a drastic decline like "normal" players do.
I believe that he's in the Jagr class of freaks and that he might continue to be excellent even at 40 (maybe not winning Rockets but 30-40 goals being a possibility). Now, he does have a family, so idk, maybe he'll retire before his kids are NHL prospects