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					Originally Posted by  wuttang
					 
				 
				thanx for the info.   
Studies have shown speed, range and arm strength should peak at an early age and only decline there after.   
I don't think it's a big deal, but it would be nice to see defensive acumen(?), baserunning/stealing and bunting improve as a young kid plays more and gains experience, as those things CAN improve. 
 
I can see a 2B moving to SS and struggling, and i can see a LF/RF moving to CF and struggling (last year's Choo) but a good SS moving to 2b or 3b, or even the Outfield, ala Mookie Betts and Billy Hamilton, shouldn't have their defense suffer so much for so long. 
 
I guess off to the editor to make a few personal tweaks ^^ 
			
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 So, there are two factors here.,  The raw range/error/arm/DP ratings, and positional experience.  Range/error/arm ratings do change over time, the range rating in particular rises for young players as they age, then starts to drop off in the late 20s, as a general rule.  It's pretty much how you'd expect it to go logically, with a great deal of player-to-player variation, which is also intuitive.  Some guys get away with bad reads due to great reflexes, then figure out how to cheat a bit to get an edge just as their natural range/reflexes begin to decline.  Positional experience, which I think you are saying has too much of an impact on performance, is a straight accumulation on a per-position basis.  If you move a Gold Glove SS to 1B in the middle of the season, he's going to suck relative to all but the very worst defensive 1B in the league.  Perhaps positional experience is overly weighted in the play-to-play results, but the raw defensive abilities do change in the editor over time.