The number of Minnesotans over 65 will more than double in the next two decades, reaching nearly one quarter of the population and placing unprecedented strains on the state's families, infrastructure and health care system. For the first time in Minnesota's history, retirees are expected to outnumber children, meaning dramatic changes in schools, churches, sports leagues and other institutions.

The Twilight Zone is an occasional series by Star Tribune reporters exploring the ways, good and bad, that this "silver tsunami'' will change Minnesota.

July 18: Look no further than Roseville for a glimpse of our graying future.

Aug. 2: Helping seniors stay at home.

Aug. 22: Aging boomers will strain family caregivers and state budgets.

Today: End of an era for young third-ring suburbs.