scout player or 5 star players on the market?

[Joshiko]

if you can sign a 5 star player with just 1 token, definitely you must go with it. don't bother with the scout players. by signing young 5 stars players, at the end of the season they can gain a new star and become scouts. in your level you don't have to have scout player to win the title. so just save your tokens for the next season. you can sign your scout player later when your scout list shows a young and versatile talent

[xfer]

Ok. So a young 5* offers more compared to scout players.

How young is young tho? Only those below 20 years old?