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Still, we all know a player with the age of more than 35y old can't have a good performance like a player in 25y old, and nothing can change this, even if the player is in their best form.
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Again I have to disagree with you. Did you watched Lionel Messi during Qatar 2022? He was 35 year old. And for me, he was playing at his peak form. When he was 25 years old, I don't think that he was this good. So you can't issue generalized statements. Including younger players is good for the team. But if the younger players are not performing up to the mark, how they can be included in the squad? Players like Messi, Ronaldo, Neymar, Modrić and Kane are rare. Such players emerge only once in a while. You can't suddenly include some young player and expect him to play like Messi.