I agree that the age of the player and number of miles put on an arm make a big difference in recovery time tables, and that was mentioned in the article. With that said, there are players regardless of their age that tend to heal much faster. In my example, both players (my son & friend) were two way players in HS and the same age...the biggest difference is where their surgeon took the ligament from.
My son had his ulnar moved as well when the TJ surgery was performed. The fact that he's had prior issues with his UCL in the past suggests to me that he'll take longer in his recovery. It's frustrating to him, and I'm not gonna lie, for me too...but patience is important, and I'll continue to preach the marathon speech to him and me.
I certainly can't argue the fact that it takes longer for older ballplayers to return from surgery, in fact, that can be said to all of us as we age...athletes and arm-chair QB's a like.