How about building an over-50 restaurant and operating it
Anybody have ever thought of running a restaurant and have it staffed entirely with senior citizens? We know Starbucks pulled that off in Mexico City! The music they play in the background is the old Swing, Big Band, or classical. Kirkwood, Missouri could use some. The City of Kirkwood has council meetings every 2nd and 4th Thursday of each month.
Seniors are just antique people rich with history.