Peter Suderman's analysis reminded me of a saki/sushi party in Manhattan with "my generation." The conversation revolved around a guy who had just started a magazine. It was an incredible idea, he told us, such that as soon as we saw it we'd think, "What an incredible idea." We asked him what it was, but in all seriousness, he wasn't allowed to tell us. Following awkward silence, he added, "You'll know when you see it."
update: For a more sustained and less snarky generational analysis than my own, consider the cover story in the current Books & Culture, Getting A Life. While I prefer "adultolescence," Christian Smith uses "emerging adulthood" to describe the above phenomenon. The money quote: "Authentic selves are made more than found."