Being the manager of a business demands insights into current activities and far away trends.
Put yourself into this scenario: You are a middle age subject expert with one foot in technology and one foot in management. You are hard working and want to create new opportunities.
Large businesses loose such experts to their inability to respond to business opportunities opened by such wiz kids. These are the new managers of future enterprises. Firms like ORACLE are based on such keen and professional individuals.
Whether Manager of small or large Businesses you need to take on trends and requirements.