We are currently in an era of football where the top managers are in the main all much younger men, because their drive to succeed is uninhibited by advancing years.
Van Gaal who you mentioned earlier, was one of the top managers in Europe and has won many, many trophies but he is being made to look like a Dinosaur now....because that will power to adapt your tactics and try different things is on the wane.
Body Language can be subtle but noticeable such as body movements, between whether someone has their arms folded or whether they are gesticulating.
All i am asking is at 66? is the motivation really there to adapt the way you approach things, or are you going to feel comfortable retaining the methods that served you so well as a younger man.