Is Facebook for old fogies a log-off for youths?

When Amy Waldman first signed on to Facebook last year and started to send joking messages about good grammar back and forth with a new 18-year-old friend, Waldman’s 19-year-old daughter, Talia, upbraided her for not revealing that she was actually in her 40s.
“You have to tell her you’re old,” she explained, “because on Facebook, that’s creepy.”
Waldman created a Facebook group to commemorate the incident: “over 40 is ‘facebook creepy.’ ”
It’s no secret that Facebook, which started as a networking playground for college kids, is graying, and that the percentage of active members who are over 25 years old and out of school has risen to some 40 percent of the overall population of about 45 million.