Yeah, that's them.
Though I haven't exhausted (well, let's be honest, I haven't done much research at all in X in this area with the introduction of the pitching model and its stamina issues) the possibilites, the long term simulations I ran to examine whether the modifiers for my converted league from 9 would hold up, indicated I could stay within a range of RonCo's early findings in that version:
http://www.typosphere.com/Age_and_De..._Modifiers.pdf
I didn't want to take my current league ahead (it would be like seeing into the future! I didn't want any spoilers) but created one very much like it and simmed a few years. I'd say, given my expectations in my world, that it falls in line with my ambitions. I'm sure they wouldn't be to everyone's liking, but e.g. of say, the ~40 oldest each of pitchers (either role) and hitters, about 4-5 years down the line I end up with ~6-8 pitchers 39+ and maybe 4-5 hitters 39+. As they say, your mileage may vary. I'm sure a lot of other factors play into this, but the model - as I want it to perform - "seems" to project rather adequately compared to RonCo's targets, but more specifically my own. I'd
never be able to analyze the thing that deeply. I'm sure you could, though.