The age of our players is an issue for me too:
U21: Grimshaw, Adarabioyo, Duhaney, Foden, Dele-Basiru, Nmecha
21-25: Ederson, Stones, Mendy, Laporte, BSilva, Sané, Zinchenko, Sterling, Jesus
25-29: Walker, Danilo, Gündoğan, de Bruyne, Delph, Agüero,
30-34: Bravo, Kompany, Otamendi, Silva, Fernandinho, Yaya
We have a hell of a lot of inexperienced/young players and players over 30 who we are relying to be key players for us. And we have very few players in their prime years of 25-29 who are key players for us.
At 25-29 years old you have developed your talent to as good as it’s going to get, you have the experience to know what to do and have the fitness to do it. Younger players aren’t anywhere near their best yet and older players lack the physical ability and concentration they once had despite still having the quality.
At 25-29 years old we only have Walker, de Bruyne and Agüero (who will be 30 by the time next season starts!) who we rely on as key players. Whereas I think to maximise the results of a squad this should be the mode age group of the key players in any squad.
Now this fairs well for us for the 2020-21 season when (if they’re all still here) all but Jesus in that group of 21-24 year olds will be in their prime years. But that’s three years away yet.
In the meantime I think we need a defensive midfielder and a forward who will be key players for us (starters, big signings, ones we rely on to win/boss games) who are in those prime years. That’s our biggest area that needs fixing in the short term for me.