Excellent questions to seek answers to. Probably even more important than the neighborhood would be the location of the actual home. Is it within easy walking distance of a coffee shop, park or golf course which your dad would visit regularly? Is the attraction visited regularly by people who would be friendly to your dad?
Although people often are most successful starting up casual friendships with people their same age because they are going through similar things, the most important thing is do people regularly go there or only from time to time. If the same people are there regularly, it is easier to develop friendships.
Some people have definite preferences about what their neighborhood should be like. Are there trees or are there too many trees? Take your dad to several different environments and see how he first reacts. That will give you a good idea what appeals to him. From there pick houses which have a similar feel but are located near a golf club, a public swimming pool, a coffee shop or something your dad would feel comfortable hanging around.
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