Bob is definitely right that the punishment is less at WR than RB and that plays into it, but I don't think that is the main reason for the longer career window. QBs get punished with hits they can't protect themselves from (and by 300 lb guys like Bob pointed out), and yet QBs play longer than almost any position.
Some positions rely on raw athletic ability to a greater degree and those positions have dramatic performance declines. At WR a veteran can make up for declining speed with superior route running, rapoire with QB, and hands. That is why Wayne (and Rice, Carter, Tim Brown, and pretty much every quality WR of recent times) was able to perform well into their 30s. Even Randy Moss is contributing on a playoff team at his age and he isn't the type to take care of himself and condition/train.
Andre will slow down but not in a way that keeps him from getting the best of a DB on a deep in (his best route these days). Unless injuries derail him he should perform close to this year's standard for years.
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