Trained At Club (15-21) - How many years?

I've got a player who I bought in January 2017 and is now listed as 'trained at club (15-21)' in August 2019. I was under the impression that you need to have the player at the club for 3 years before they get that status, is that not the case?

I think it's done by the 3rd end of season date that your player is at the club for these days rather than 3 full years.