Conversation so far:
Can you provide me with a little information about Walter Winterbottom and Walter Winterbottom's career as an England Team Manager?
Walter Winterbottom has the distinction of being England's first, youngest and longest serving England team manager.
How long did he serve as an England team manager?
his departure in 1966.
How old was he when he first began his career as a team manager?
Walter Winterbottom has the distinction of being England's first, youngest.
What led to his career as a team manager?
he is also the only England manager to have had no previous professional managerial experience.
Was he ever trained?
CANNOTANSWER.
What else is unique about this time as a team manager?
he is also the only England manager to have had no previous professional managerial experience.

Question: What are some important aspects of his career?
Self-contained rewrite: What are some important aspects of career of Walter?