Greek players as I mentioned before peak early 30s. When we won the euro our average age was quite up there age 29.
Italy same thing with their world cup win
https://www.transfermarkt.co.uk/europameisterschaft-2004/durchschnittsalter/pokalwettbewerb/EM04
England is known for fielding youngester. SEe how that's working out for them?
Experience is king in knockout round and short group stages where the margin for error is low. Composure is generally correlated with age imo.