Merry Christmas to you all indeed! : )
I didn't notice your effort in Utopia, very nice one!
My initial intention was to split the players into ages up to 29, which I believe is the last "must" season for a player.
30-31 should be still mandatory for beasts prospects, but a polishing in ST and FT can't harm anyone.
In my opinion, leaving one person with 3 or more ages can be overwhelming, considering there would be some 2 players per position, per age, as scope of work. At the end of the year it would just take the next manager to update "his tab", and also be able to know whether the coming players to their new age are better or worse.
Ideally it should be improving.
Speaking of scopes, it's obviously the manager setting the training and all. However it would be great to tell, follow what I say, and you'll have a beast the NT can use.
I bother a lot. I have been sending emails to ex NT managers from those past glories, and currently I have created with a lot of work a database with over 1000 NT level players (I'm on the market every week), counting those from the top NT teams. I can see patterns and, like you, ready to guide the training of a player to reach top NT level to the possible extent.
But back to the current topic, would it be doable to do the age split among us? And maybe agree on role models per position?