A version of this article first appeared in the CNBC Property Play newsletter with Diana Olick. Property Play covers new and evolving opportunities for the real estate investor, from individuals to venture capitalists, private equity funds, family offices, institutional investors and large public companies. Sign up to receive future editions, straight to your inbox.

Senior living has long been a somewhat under-the-radar real estate play, with a somewhat unappealing reputation. But it's on the edge of a boom — a baby boom, to be exact.

More than 4 million boomers will hit 80 in the next five years, and occupancy at both active adult and assisted living communities is already rising fast. This comes as annual inventory growth in senior housing just dropped below 1%, the first time

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