Football

and that year wasn't anywhere near his best, of course.

Similar for Ken Anderson. He hung around until age 37, but at ages 36 and 37 he was only slinging the pigskin 44 yards max, whereas at age 35 he still hit 80 yards!

One fellow I forgot was Peyton Manning. He had phenomenal seasons at age 36, 37 and 38. Then, rather ironically, while he was vastly diminished by a torn quad and plantar fasciitis at age 39, he won a Superbowl with the Broncos, but that was largely owing to the team's amazing defense.

And another guy I failed to mention was Dan Marino, who was very good right up until a rather steep decline at age 38. Then he called it a career.