Apart from fast train younger players, I haven't found any difference between younger and older players really. When it comes to scouts they're mostly 24+, lucky if you happen to get a lot younger than that on your list. But I wouldn't not buy one just because he was 25-26. Not if it was a position I wanted to strengthen.

Even if the GK was a slow trainer, it'll take you a long time to train that younger transfer market GK up to his Q - by then he won't be so young anymore!

With a scout, the way i look at it, a lot of the work has been done for you.