Van Gaal is set to be announced as the new Red Devils boss at the start of next week before leading Holland to the World Cup next month.
Ryan Giggs looks set to be appointed as van Gaal’s right hand man after his short spell in caretaker charge towards the end of last season, but the Welshman is keen to either continue playing for one more year or become an immediate number one.
Fowler believes United should have plugged for someone younger than van Gaal and believes Giggs is already lined up to take over eventually.
“I don’t know if Louis van Gaal is the right man for Manchester United,” Fowler said.
“He’s had his time. It might sound silly, but he’s too old.
“You can’t argue with his credentials and what he’s achieved, but Man United should have gone for a young, vibrant manager.
“The board might have said to Van Gaal he needs to get Giggs ready to take over in a few years. That was one of the stumbling blocks early on. Whoever came in would have to take him on to the staff.”