Specifically, the headship rate among 20- and 30-somethings continues to drop. Young adults are living at home longer, or living with roommates to a larger degree than a decade ago, let alone two decades ago. Within the Portland region this decline means there are nearly 28,000 fewer households today among the 25-44 year age group than there would be if household formation rates were the same as back in the mid-2000s. Across all age groups, the decline in household formation rates in the Portland region results in 36,000 fewer households on net. This is equal to 3 years of new construction, which is a massive number.Josh Lehner — Is Household Formation Strong or Weak?