BOCA RATON, Fla. — Susan Shapira, who is 58, recently moved into a condominium in Century Village, a gated retirement community here where most residents are almost as old as the name.

In the nine months she has lived here, she has learned some of the drawbacks of being a baby boomer among the very old.

“I don’t see anyone after dark,” she said. There is zero night life. The bus is often delayed — walkers slow people getting on and off. And her building’s resident representative had been hard to find after going into rehab for a back injury.

But Ms. Shapira says she has no regrets. She bought her two-bedroom condo for cash — $26,900.

“It’s like a car,” she said.