Youth players and training queries

Just getting back into the game and have a few queries concerning youth players/squads and training. Might seem obvious but just wanted a confirmation for peace of mind.

• What happens when players in a youth squad turn 24 if the senior squad is full?
• For trainers, which players does the 'youth players' stat apply to? I'm presuming 23 and under and afterwards its just the coaching outfield/gk stat which applies.
• Does the number of players in a training group make any difference?
• Does having the same trainer lead an exercise in both the youth squad and senior squad make a difference?

Many thanks.

Cant Score wrote:

• What happens when players in a youth squad turn 24 if the senior squad is full? = they are still promoted but that doesn't release the squad spaces in the youth squad.
• For trainers, which players does the 'youth players' stat apply to? I'm presuming 23 and under and afterwards its just the coaching outfield/gk stat which applies. Correct.
• Does the number of players in a training group make any difference? No.
• Does having the same trainer lead an exercise in both the youth squad and senior squad make a difference? No.

Cheers Sudoku