I know very well about the impacts of judo in the body as I'm a judoka myself. I also know judokas who are older than Fyodor and far more successful than him in the sport that can still do extremely well. There are also MMA fighters about the same age or older that still have a sharp ground game (Mir) so please spare me the "his body is too old/injured for that". He fell in love with KOing people a long time ago and stopped fighting smart and doesn't take the ground aspect into consideration anymore. Not to mention that he trains BJJ with nobodies in Holland! And if that's really the case than he really shouldn't be competing anymore because he's only getting brain damage.
edit: I just checked his record; I couldn't remember his last submission I thought it was against Choi, I was almost right. It was against Sylvia in 2008 but that started with a storm of punches. Choi, an armbar, happened in 31 December 2007. Almost a decade ago.