“Cities got old....”
That has little to do with why Detroit has failed as a city. Older cities on the eastern seaboard are doing just fine. Detroit declined because the union-sponsored communist Democrats created a socialist city that penalized successful people. Those people, feeling unwelcome, left the city. Now the place resembles a low-budget 1970’s post-apocalyptic sci-fi movie set.
Except that the apocalyptic disaster came in the form of the Communists from the AFL-CIO and the Democrat party.
I'm sorry I have to bring up this uncomfortable fact, but I grew up and lived in Detroit through the era of it's fall and it's simply a coverup to pretend that the UAW, Democrats or Socialists were the main instrument of it. Many of the people who screwed up Detroit couldn't even spell Socialism, much less tell you what it is.
The Detroit Riots, the key act in the death of the city, were not labor riots, or Democratic riots, or Communist riots.