Former screen siren Jane Fonda has a bizarre obsession with feet — and insiders have revealed the Walk on the Wild Side beauty is an absolute fanatic when it comes to taking care of her peds. She is even picky about the tootsies of possible dates, the sources added. The 86-year-old is still hot to trot but said she’ll only date younger men because she doesn’t like “old skin.” However, sources said even then, the men must pass foot inspection! Said a source: “If she dares to go on a date or meets an interesting younger man at a dinner party, she must see his feet. “If he doesn’t take care of th…