 The final part of the book suggests that most people have three significant moves : when leaving their parents ' home , when starting a family , and when retiring ( or when their own adult children move out ) . When young people leave their home ( or when they complete college ) , they tend to locate to areas that offer attractive job markets , cultural or recreational amenities , and rank high in quality of life factors . When they get married or have children , people choose areas that are perceived as safe and family @-@ friendly . Florida suggests using a " Trick @-@ or @-@ Treater Index " to gauge if parents feel safe allowing their children to go door @-@ to @-@ door on Halloween . He also cites Catherine Austin Fitts ' " Popsicle Index " , which gauges how far are parents willing to allow their children to walk to buy a treat . Once retired , or when their adult children move away , people tend to gravitate towards similar areas as young people , if it is close to their grandchildren , but in quieter neighborhoods that provide opportunities for hobbies or for a second career . 
