Fox Bowl in Wheaton offers Free Bowling with Free Shoes for Seniors every Wednesday. You can bowl for up to eight weeks for free after which you pay regular rates to continue. Not an official league - just bowling for fun and exercise.
Let's meet in the restaurant at 12:30 and hit the lanes for practice at 12:50. You can go every Wednesday, or whenever you choose, but eight weeks after your first visit you have to start paying the regular rate (which is also a bargain at $7 for shoes and three lines of bowling!).