Answer:
naturally occurring retirement communities ( NORC )
Explanation:
Naturally occurring retirement communities -
It is the type of community , where senior citizens , i.e. , people with age above 60 years , gather in large number , is referred to as a naturally occurring retirement communities ( NORC ) .
It is a type of informal center for the senior citizens.
Hence, from the given information of the question,
The correct term is naturally occurring retirement communities ( NORC ) .
