That's what wowed me about Emmitt Smirh. He was about the same until his early 30s
That's because Emmitt's game was never predicated on speed. It was built on vision, change of direction, balance, patience, acceleration and most of all intelligence and toughness. Those things don't abandon you over time.. At least not as much as speed and quickness.. If you watched Emmitt even as far back as high school the first thing you noticed about his running style is he never appeared to be in a hurry. His patience was legendary and his vision to see the blocking develop and acceleration through it were second to none.
Ironically Zeke didn't really started to work on his patience and vision until year three. Then in year four he had become much more patient.. only by the offensive line was starting to decline.. So the holes he had now conditioned himself to wait for were not longer coming. Or at least not sticking around for very long. At the same time Kellen Moore took over the offense and the offense became much more shotgun heavy.. which simply wastes Zeke as a runner IMHO. Giving him the ball from a standstill is just dumb. He needs to get the ball going downhill .. We do do that very much anymore.. and I hate it.