i wouldn't said anything about it because i know there are 2 type of trainers
either they do team training - stamina and ft, or they are focus on normal skills
team training got everybody trained, so a broder range of age can be sample
however normal training manger wouldn't waste training time on 26+ players , and there is unually 6 players trained(2 position)
the sample range and size is rather small and limited, the conclusion doesn't say much