The baby boomers in pursuit of housing were very different, demographically, from their house-hunting predecessors. They married at an older age and had fewer children, and their children were born later. Women, both single and married, were entering the labor force at higher rates which led to an increase of dual wage-earner households. These households were typically composed of young, more affluent couples without children. Because these couples were child-free and were not concerned with the conditions of schools and playgrounds, they elected to live in the inner city in close proximity to their jobs. These more affluent people usually had white-collar, not blue-collar jobs. Since these white-collar workers wanted to live closer to work, a neighborhood with more white-collar jobs was more likely to be invaded; the relationship between administrative activity and invasion was positively correlated.