WASHINGTON — Many of America’s young adults appear to be in no hurry to move out of their old bedrooms.For the first time on record, living with parents is now the most common arrangement for people ages 18 to 34, an analysis of census data by the Pew Research Center has found.And the proportion of older millennials — those ages 25 to 34 — who are living at home has reached its highest point (19 percent) on record, Pew analysts said.Nearly one-third of all millennials live with their parents …