A fast 5* 18 year old player at L1 will make it to around L10 by the time it comes for the player to retire. I had a 5* 29Q 18 year-old striker on July Fourth @ L2 and made it all the way to be sold as a 29 year-old 3* 72Q player @ L13.
A good striker then.
If my Polish MC doesn't perform today against Wild then he goes up for sale
Season 1 League: Winners
Season 2 League: 2nd, Champions League: Runners up
Season 3 League: 1st, Champions league: Quarter Finals, Cup: Play-Off