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About 10,000 millennials are turning 40 every day in the US, and a lot of them are doing quite well for themselves (among those turning 40 this year: LeBron James and Mark Zuckerberg). And when people enter their 40s and have money to spare, writes Conor Sen, they “tend to want nicer housing than they did in their 30s.” Meeting these high-end buyers’ needs will be key to making housing more affordable in the coming years.