At the current trajectory, that's set to weigh on the economy for the next decade or more. AdvertisementMillennials aren't having as many kids as previous generations, and that fact could end up dragging down economic growth for more than a decade. "What you're talking about is these birth rates dropping very, very low levels, which over the course of time has huge impacts on the economy," Pomeroy said. The impact of millennials having fewer kids will likely be worse than the impact of aging boomers — and the most dire consequences could come 10-15 years from now, Pomeroy estimated. The most important thing to encourage people to have more kids might be a cultural shift in how we talk about children, Buchholz says.

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