Your child is now an adult, but that doesn’t mean he or she is leaving home.

As a matter of fact, 36 percent of young adults between the ages 18 and 31 continue to live with their parents, the highest percentage in some 40 years, according to a new research report.

“A record total of 21.6 million lived within their parents’ homes in 2013, up from 18.5 million of their same-aged counterparts in 2012,” according to a Pew Research Center report.

The report, which counted young people not at home as living independently of their parents, was largely based on US Census Bureau figures.

Who are these young adults who stay or return to the nest in their 20s and early 30s?

They are much more likely to be male than female (40 percent of all young men versus 32 percent of young women).

About 40 percent of these young adults are living in the Northeast, and they were much more likely to be without a job than they were to have one.

This is underscored by the dramatic drop in all 18- to 31-year-olds who are employed.

The report said that number declined from 70.3 percent in 2007 to 63.4 percent in 2012, a drop of more than 10 percent.

Stay-at-homes — whether they never leave home or leave and return to the nest — are also likely to be those without a higher education, the report said.

Richard Fry, a senior economist for the Pew Research Center, said the jump in the number of young adults living at home started in 2007, which was just before the economy went into its tailspin.

“Much of this is related to the economy,” he said.

However, he added that “something else also has been going on.”

Fry noted that the rates of young adults staying at home surged dramatically in 2007. Before that year, he said, those rates had hardly changed, going back to the 1980s.

Fry concluded that “it has become more acceptable for young adults to stay at home.”

“Since 2007,” the Pew report said, “young adults have grown increasingly likely to live at home. This is a new trend.”