As baby boomers grow older, the volume of unwanted keepsakes and family heirlooms is poised to grow — along with the number of delicate conversations about what to do with them. According to a 2014 United States census report, more than 20 percent of America’s population will be 65 or older by 2030. As these waves of older adults start moving to smaller dwellings, assisted living facilities or retirement homes, they and their kin will have to part with household possessions that the heirs simply don’t want.

“We went from a 3,000-square-foot colonial with three floors to a single-story, 1,400-square-foot living space,” said Tena Bluhm, 76, formerly of Fairfax, Va. She and her 77-year-old husband, Ray Bluhm, moved this month to a retirement community in Lake Ridge, Va.

Before the move, their two adult children took a handful of items, including a new bed and a dining table and chairs. But Mrs. Bluhm could not interest them in “the china and the silver and the crystal,” her own generation’s hallmarks of a properly furnished, middle-class home.

The competitive accumulation of material goods, a cornerstone of the American dream, dates to the post-World War II economy, when returning veterans fled the cities to establish homes and status in the suburbs. Couples married when they were young, and wedding gifts were meant to be used — and treasured — for life.

“Americans spent to keep up with the Joneses, using their possessions to make the statement that they were not failing in their careers,” wrote Juliet B. Schor, the Boston College sociologist, in her 1998 book, “The Overspent American: Why We Want What We Don’t Need.”