Here's something that came as a revelation to me recently. There was some sort of discussion about Mickey Mantle's career on the other board and I looked him up on B-R. It has often been said that Mantle hung on too long, that he was a shell at the end, etc.
His last year was 1968. The big tragedy was that he hit .237. But his slash line was 237/385/398 for an OPS of 782. That was the Year of the Pitcher, and his OPS+ was 143. Not that bad at all! The lowest OPS+ he had for any year from 1952 to 1968 was 137.