it's somethign i try to do, but not sure if it matters...
when they get old i like to play them less in the field (DH etc), but i don't think it actually affects aging/change of ratings etc. i might as well just keep throwing them out there, if competent.
like what moe said.. along with my own anecdotal experiences (NOT EVIDENCE)... i'm starting to believe that it's a complete random process or at the very least not tied to playing time in any way shape or form. so, don't be scared of "overworking" an old player. i simply don't believe it's in the game that way anymore.
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