Several times a month, Jim Maybach drives 5 miles from his house in Hay Creek, Minnesota, toward the Mississippi River. When he reaches Red Wing, a city of nearly 17,000 people, the 79-year-old retired engineer stops to pick up a senior whom he then delivers to an appointment, such as a dentist visit or an exercise class. When the appointment ends, Maybach is there to drive the person home. It’s a route and routine he repeats a handful of times each month. Maybach is unpaid, a volunteer among a cadre organized by Faith in Action in Red Wing, a nonprofit that relies on retirees to ferry residen…