Politifact mentions the Democratic Underground

[muriel_volestrangler]

9. That's not the same thing being measured

Politifact says, quoting the Pew poll, "Among adults ages 18 to 29, 42 percent of those who have graduated college live with their parents". The number of people in an age group currently living with their parents is quite different from "85% of college seniors planned to move back home with their parents after graduation last May". It's entirely possible both figures were true when they were first quoted.