What's the word that means when the people in a neighbourhood have all gotten old?

I thought it was called gentrification but it's not.

exotherm12009-05-21T16:31:16Z

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I don't know of a single word, but can you do something with

"geriatric"?

BabyGirl2009-05-22T00:17:26Z

Geriatric....it sounds better than DEAD.