Has the age group for training speed changed?

[1D1C1]

In what case in particular? age of a player that all of sudden needs more boosters? 21? 24? 27?

The last year of each age category, 21,25,28. Almost one year ago, I use to build my team with only youngsters between 18-21 with high performing attackers as the only exception. But ever since Nordeus greatly reduced the frequency of 18yr old FT in auction, I adapted my team building to 18-25 for high performers of all positions. I have a habit of power training selected players at 21 & 25 to preserve their quality beyond the current season. This season, it just felt as though my players are missing roughly 1% stat gain from every 6 drills of training.