Training speeds

[DiZZee]

You could have an 18yr at 30Q and an 18yr at 25Q at the same price. All that it means is that the 25Q has greater potential.
Whether he realizes that potential is totally dependent on the manager training, playing, use of boosters etc. during the players career.

[Alex Webster]

You could have an 18yr at 30Q and an 18yr at 25Q at the same price. All that it means is that the 25Q has greater potential.
Whether he realizes that potential is totally dependent on the manager training, playing, use of boosters etc. during the players career.

So, is there an upper limit beyond which a player can't improve? Sorry for asking such newbie questions!

I really want to get one fast trainer in my squad (preferably a striker where I'm weak).