Honestly, the competition at the EURO is probably even greater than at the World Cup because the quality of the participating teams is higher.
At the EURO, there are no weak teams that can be easily beaten by a large margin, as sometimes happens at the World Cup.
That is why my expectations from the Croatian national team and Modrić are that it will be much easier for them to win the title and the gold medal at the final tournament of the League of Nations in June this year than at the EURO. After the final tournament of the League of Nations, Modrić will most likely say goodbye to playing for the Croatian national team.
As for the rest, the age of the player should never matter, but only the quality of the game.
If the quality was so high, then the following outcomes were not possible in Qatar 2022:
1. Australia defeating Danmark (1-0)
2. Japan defeating Germany (2-1)
3. Japan defeating Spain (2-1)
4. Morocco defeating Belgium (2-0)
5. South Korea defeating Portugal (2-1)
On all these instances, European (UEFA) teams were defeated by teams from AFC or CAF. The days of European dominance in football is over. The sooner you realize it, that much better for you. Else you will continue to lose bets on these teams.