With NH’s aging population projected to get even older, one sector of the state’s economy is booming: retirement communities.

“It’s math. There’s an absolute need,” says Justine Vogel, president and CEO of RiverWoods Retirement Communities, noting the state’s population of those over 75 is expected to grow 119% between 2020 and 2034 to 230,000. “That’s more than double. It’s crazy.”

Communities that cater to elders, as …