The average age of a squad in the PL is 27.4 yrs old. Man City's is 28.3, Chelsea's 26.6. Ours is 25.7 (second youngest to Spurs), Arsenal and United both over 27.
Obviously buying players around that age (or younger by a year or two) will help maintain a squad age (as obviously all are aging) whilst buying 18-22 year olds will give us less experience and fewer leaders on the pitch.
Interestingly I think it was Juventus who put out a team in the CL with an average age of 31 in one of their matches this year (quarter-final I think).
https://www.transfermarkt.co.uk/premier-league/startseite/wettbewerb/GB1
The average age of the squad is one thing but if you look at the players that have started the most games for the latest title winners its a bit higher.
Chelsea have started nearly the same core of players all season, average age of 27,5. Thats without Fabregas (31) and Willan (28).
Leicester last season 28,3.
If we are to improve next season and challenge for the League we'll obviously have to buy both some established players that can make an impact at once, and some younger players we can develop with a more long term view.