right @barisbilgili, i agree with you, Modric's quality is indisputable but age advances for everyone, even for him, and it could affect his performances and if it doesn't affect them it could cause problems with physical fitness and injuries
This is the risk of having older players, we just have to take note of it
Looks like Milan didn't consider your points before going for Modric. A club should go for a younger player who will play for long in the club. When a young player is growing, he improves in skills and quality but for old players, they become weaker and lose their pace as they grow older. Gone are the days when old players were the best due to experience. Currently, the younger players gat it all.
The old players have always been there and will continue to be there, it's normal that they form a group, they give experience and create a better environment, it's useless to say that this is only an advantage for a club as it was for Ibrahimovic, it will be the same for Modric too