I don't. Here are all of the players and the years in the study. But they don't list age. Someone could look it up if they wanted to.
http://www.footballdocs.com/running_back_carries.html
Thanks. I did look it up.
Interesting trend I discovered.
All of the backs listed with the exception of one, totaled their most carries and most yardage in either their fourth or fifth year.
Larry Johnson 416 (carries), 4th year
Jamal Anderson 410, 5th year
James Wilder 407, 4th year
Eddie George 403, 5th year
Gerald Riggs 397, 4th year
Ricky Williams 397, 4th year
Terrell Davis 392, 4th year
Barry Foster 390, 3rd year
Of course, Eric Dickerson toted the rock 379 for 2,105 yards in his second year. In his fourth year, he carried 404 times for 1,821 yards and in his eight year carried 388 times for 1,659 yards.
What does this tell us?
I don't know other than unless you're a super stud like Eric Dickerson, when you hit your fourth or fifth year, if you're carrying the ball 370-plus times, you're likely not going to be able to carry a load like that any more in your career.
So unless we're still giving the ball 370-plus time to Zeke in his fourth year, then he should be okay.
Then again, my conclusion isn't scientific by any means. And to fully grasp this issue, one would need to see how many times in college these backs carried the ball because the number of college carries could play somewhere in this.