Butler drew walks, Ichiro doesn't. Playing until you are 40-42 is not the same thing as maintain the level of performance through your mid-30's. Who, exactly, would you expect to "maintain [their] level of performance through [their] mid-30's"? If you're looking for a guy that'll be just as good at 38 as he was at 28, well, good luck with that. Virtually all players decline through their mid-30s. That's the way things work. Nobody's arguing that Ichiro is somehow immune to this reality. The point is, Ichiro is arguably less prone to a mid-30s decline than other guys with different skillsets. You've been shown anecdotal evidence to support this (your hairsplitting notwithstanding), there have been studies done that support this, and beyond that, it's just simple common sense that a more fit and athletic player is going to be less prone to natural age-related decline than a less fit, less athletic one. Ichiro most definitely is in the more fit, more athletic column. Therefore the notion that, because Ichiro is speedy, his production is therefore going to tail off more rapidly than joe average ballplayer is completely nonsensical and false.