I see nothing wrong with the way it is now. When you've just started, you're playing at a very low level. Your 5* young player could be, well, me or any other decent young footballer on a global scale. As you move up the levels, you'll get older players who are much better than the youths you have, Giggs, Zanetti, etc.

Main point, you are at a low level, and there will always be old players from higher levels that you can buy that are as good as your youths, like how veterans always spend their last few years in the lower leagues.