Are suburbs for old people only?

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Suburbs consistently have young populations with relatively low numbers of elderly people.  The school age population as a percentage of the total population is consistently higher than inner-cities and rural areas.

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Suburbs become too homogenous and it is ultimately bad for them.

Bloomington, MN for example boomed from 5,000 in 1940 to 80,000 in 1970.  In 1970 there were 26,000 students in the schools.  By the mid-80s it was less than half that.

Now the city has a huge number of old people that initially moved in during the 40s and 50s.  As they are aging and moving into nursing homes or dying, the aging housing and infrastructure needs to be updated in order to remain competitive for younger people looking for a place to live.

If they don't jack up the taxes and fix it up, it will ghettoize.  Places like Bloomington are gentrifying.  Places like Brooklyn Center are ghettoizing. 

The anti-tax people just move into the exurbs and live there until the brown people start to move there and then they move further out and keep ghettoizing everywhere htey just left by voting down taxes to improve infrastructure.  You can only get so far away from the center of a city before the whole thing goes into free fall (Detroit, St. Louis).