If all the fast food places close, would we all go crazy,,,we did not go crazy in the 50s when they were few and far between,,,so whats the big deal,,,eat at home, now there's a thought,,we are lazy IMHO,,,ok,,lets go get a burger,lol.
1) You are old, you have time, your kids are all grown up
2) Fast food is a broad range, many fast foods are actually fine (i.e. fast casual), not all are unhealthy, even McDonalds are ok if you skip soda, fries, super size, etc.
3) Many American home cooked foods are just as unhealthy, i.e. Alfredo and Mac & Cheese.
Many people would starve without McDonalds. I eat them weekly and I'm probably healthier than 80% of people here who demonize it. That said, I only eat McDouble and McChicken, split a large fries among 3 people, never drink soda. They probably would close if everyone is like me.