in the old days,american families were bigger. people had more children,and grandparents and great-grandparents lived with their families. but now, families are smaller, and many old people

　　live alone. at the same time, americans are living longer and longer. the number of old people is always growing.some old people like to stay in their old homes. they do not want to move from their old homes. they do not want to move from their hometown. they are near their .friends and family. but some do not have a lot of friends. they want to meet new people. they want to live in a quiet place with otherpeople of their age.a large number of old people are moving to the south. it is warm there. you do not have to walk through the snow in winter,or pay a lot of money for heating.

　　a large number of old people are moving to the south only for old people. one of these is sun city, near phoenix, arizona. all the families in sun city must have one person over the age of 50 ,and children under 18 years old can't live there.