I am currently back from a few months away. I have just bought some of the most expensive (high valued) 18 and 19 5 star young players I can find in the market. Assuming they are fast trainers.

If I am planning to progress each season to a new league level, will these players keep up with the progression? (Gain a star each season or more) or will it be more efficient to just buy cheap 25-26 year olds at the star level you need in each season?

Thanks!