Chad Johnson had knee injuries, Andre Johnson was about 31 before he slowed down, not 28. Calvin had some kind of injury that wouldn't go away, and apparently was sick of the Lions, so he just walked away. Jerry Rice and Tim Brown were productive into their late thirties, and even early 40's for Jerry. Steve Smith played forever, and as much as I didn't care for his attitude, he stayed quite productive. Randy Moss was dominant (whenever he wanted to be) for about 11 years. If receivers stay healthy, they don't get "old" at 28. RB's do. Now, everyone slows down around 30, but when you're talking about the elite receivers, they don't usually fall off a cliff at that age. Julio isn't showing any signs of slowing down, so to say he's going to suddenly get old this year is rather nonsensical, in my opinion.