i've seen a couple SS recently do well into 30's. i had an ozzie smit type that was winning gold gloves through late 30's. not often, though. if i recall... ~330 zone rating for career at SS... think 16-19years or so ish, so a very high level per year. i had brought him up as a defensive bench ss/if at 19, becuase he was ~50contact and speedy/stealy kinda guy. 3 years later he's off on his career, i potential cost him hundreds of AB and good SS years.
are you sure age is the acause for the increased errors?
go duplicate trout a few times (pairs). distribute in league to increase the test for fewer years without screwing up the stats too much, i.e. not too many. then make 1 30 and 1 25, lock ratings so no development or whatever. compare fielding. i'd bet it's just random as long as ratings are equal and not a rookie/extremely fresh experience, just in case that's a factor.
if they maintain their raitngs, which rarely at tough positions can they do so into 30's, they will be good defensive players. i trade these guys away religiously, but keep an eye on they guys that did very well for me, often.
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