I would disagree, but that's the beauty of BB and to each their own. Training tall, old guys in team training OD sounds like a nightmare haha.
BB is a game of economics and efficiencies, and you'd just be better off training someone younger at that point IMO, especially in D3. Whereas in D2 and NBBA, good luck training anyone young.
You could train donkey bigs in the time you are training OD for 4 seasons to get 2 pops of OD on your tall old guys haha.
TBH i dont really believe in training 18 year olds, so far as the most efficient and competitive strategy goes, but it's "fun".