At the moment, all of my trainees are between 20 and 24. They do slow down, but it's not too bad.
However, with you being in D.V, an 18yo trainee isn't going to be a liability for your team, and by the end of the season could be amongst your best players. You don't need to go all out and buy a MVP potential guy, you'll probably be fine with allstar, who you should be able to pick up for less than 100k.
It looks like you currently have 5 trainable big men (though 3 of them are on the short end, and you're selling one), so pick up an 18yo or two, and train 1-1 forwards and rebounding for the rest of the season (or longer, whatever). Once you're done with that, either sell off the older guys, or play them at PF / SF, and switch to one position training the guys who are left over. At least that's the plan that jumps out at me, but there are many other good ways to go.
Last edited by broncoWI at 11/12/2010 10:43:46 AM