I've been fortunate as I lived in several states and was able to travel in North America as an adult. Adults settle where they were raised, or near family, or near things they like. I've done it all. I like large bodies of water, four seasons, great parks and mountains within a reasonable drive. For me this is two places. The funny thing is today I live in one, but I could easily live in either.
If one likes an urban area with ease of shopping, job opportunity, and great entertainment for singles and families, that has super-sized parks that are green then you might like Peoria, Illinois. It is a STEM city with a low cost of living. In other words the COL is about the same in all the states that surround it. The State of Illnois does not tax your Social Security or your retirement pension dollars. On the other hand if you like a much smaller town where fishing, and hunting is surrounded by nature and tall cliffs you will probably like Grove, Oklahoma. The lake is enormous, the state park excels at features for RV and Primitive campers. It is within an hour drive of three mountain ranges. There are plenty of places to play and things to do in Grove, and in the mountains of Western Arkansas. On the whole, the COL is not much different than central Illinois.