Why is this high value 18 yo training worse than 23yo's?

[hullabaloo]

how can i know if a 5* player just became a 5* ?

[Joshiko]

how can i know if a 5* player just became a 5* ?

you can calculate his exact average quality. for example, is it 35.3 or 35.9? but if you are using your mobile i think you cannot see player's quality unless you compare it to another player in your team