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I agree with you.
If AC Milan's goal is to build a stronger club and compete for titles, they would certainly prefer to recruit younger players for long-term contributions.
Modric was indeed quite an active player in the past, but with his advanced age, his activity will undoubtedly decline, as will the stamina of an aging player.
Meanwhile, there are many talented young players who can help the club compete with other strong clubs and contribute long-term without having to spend a lot of money each season.
But let's see what AC Milan's plans are. If they only have short-term plans, they should achieve better results than before.
If Milan are really serious about building a title contender, they would double down on prime-age and young talent, not keep re-cycling old legends like Modric and Walker because of experience. We have been here before: bringing in the big names after they have passed their physical prime rarely achieves much in the long run, especially in a league that is getting faster and faster
What makes it worse, Milan's management has been all over the place since the Scudetto. Three coaches in 14 months? That is scrambling. The squad value has tanked by almost €50 million this year alone, mostly because they are stuck with high-wage, zero resale guys (your Modrics and Florenzis) while young players are left fighting for minutes behind them. Youth like Musah or Jimenez are supposed to be appreciating assets, but if you do not trust them in the big matches, their value (and confidence) stagnates
You are right about stamina and activity. There is clear data showing midfielders nosedive after 30. Modrić's football IQ is top class, but you cannot defy biology. Milan is just hoping his brain compensates for the legs, which feels desperate