I got an 18yo ML/AML from my accadamy right at the start of my season 5. I was going to reject him, but as I had a free roster slot, and he was the free player, I signed him, with the intention of selling him on for a profit. However, he was a very quick learner and soon gained and extra star (3). So I kept him.

I'm now just starting season 9, and he is still there, now 22yo. Although not one of my top players, he is still a valuable player to have in reserve. Up until now, he has played 115 games in his 4 seasons and has amassed 72 goals. He's also learnt the position of ST during that time, and all without personal training or power training. Just normal skill point gaining.