If you enter a roomful of crying but healthy babies, chances are they all share at least one of the same needs: food, sleep, a diaper, or some undivided attention from a loving grown-up. As they grow into early childhood, they will hit the same developmental benchmarks at roughly the same time, and they’ll still want and need lot of the same basics (snacks, naps, potty, hugs), though they are beginning to assert their distinct personalities. Even before preschool, the differences start to emerge. This kid loves soccer, that one only wears sandals, this kid cares about animals, this one is afraid of animals, and this kid collects menus. And so it goes as they grow, with each young soul becoming his or her own person.

Any parent or teacher will tell you that, although they may have similarities, all children are different. Yet we consistently make the mistake of behaving as if they all want and need the same things. While this is obviously practical and necessary on many levels, children become even less alike as they grow into their tween and teenage years—and we still often act as if they’re all cut from the same cloth. This true paradox is that tweens, especially, are bursting out of their early childhood selves, trying to figure out where they fit in, attracted to and afraid of the idea of more independence. They want to be “like the other kids,” but they have already formed a distinct set of likes and dislikes. They face a substantial challenge in striking a balance between being like their peers and flexing their one-of-a-kind personalities.

Marketers—and society in general—have typically categorized people by their age. You might read something like, “Adult males between the ages of 35 and 45 are more likely to have a Facebook account than adult males between the ages of…” or “New Yorkers between the ages of 15 and 18 are using the subway at alarming rates.” Classifying people by age makes it easy to survey them and is often appropriate. However, in an era of growing individualism and the use of technological profiles to display individual characteristics, it’s important to see past the demographic boundaries and begin to define people based on their cultural attributes—instead of focusing first on numbers.While we may be inclined to think of them as “ages 9 to 12,” the 12-year-old may be making the same choices as a 15-year-old, and the 9-year-old may be an early adopter of certain trends, regardless of his or her age. It’s not about how we view them; it’s about how they define themselves—and how the lines often blur between the tween and teenage groups. With that in mind, I’ve developed a new system for looking at teens and tweens by separating them into four tribes: the wired Techie; the conformist but somewhat paradoxical Preppy; the always-mellow Alternative; and the cutting-edge Independent. We’ll have look at each of these in further detail, but first, it’s important to explain why we need to look at Millennials in this way.

At some point, we began to blur the lines of which brands, products, and services should be consumed by whom. In another post, I’m going to talk in depth about the concept of a “tweenebe.” Tweenebes are adults who want to be tweens. Now, they may not truly want to be 12 again, but they are consuming a 12-year-old’s culture and loving it. Do you know those moms who love Justin Bieber? Are you one of them? Do you know dads who seem to enjoy rocking out to the Disney channel more than they should? It’s okay; they’re just enjoying the benefits of being a tween. I have to admit, in a society full of major economic, social, and political concerns, we’d all love to fawn over the latest tween singing sensation, read a Twilight book, or grab a Frappuccino with friends. Oh wait—don’t we already do those things? I think that there are more tweenebes out there than I can even imagine.

As we look at these tribes, we have to ask ourselves: Do you have to be 13 to be a Preppy? Twenty something to be an Independent? No, you don’t. That seems like an easy question to answer, but it has stumped marketers for generations. Now, I doubt that you’ll see an ad for Tampax Pearl in Sports Illustrated or a Justin Bieber ad in AARP magazine, but you will see major brand extensions happening over the next few years. And I’m not talking about product development; I’m talking about market development. Marketers have to get outside of thinking in boxes, whether it’s ages 7 to 12, 13 to 19, or 20 to 24. Technology has created so many generationally shared experiences. Facebook is no longer for elite college students. Indeed, the fastest growing demographic on Facebook is women over 50. How people think, feel, and react to brands is a completely new experience. Because of that, I’ve developed four tribes that I feel are universal. I think that these tribes definitely have subtribes (which I’ll explore in the future at some point), and I do believe that consumers can belong to more than one tribe. But the tribal migration is happening, and has been happening for years. As with any good disruptive innovation, technology has forced us to deal with this issue.

Ten years ago, if you wanted to launch a new product for teens, you’d probably launch a major ad campaign in a teen magazine like Seventeen. You would likely reach more than 10 million girls and call it a day. Fast-forward to 2011, where readership of Seventeen is now about 4 million. Where did all those readers go? Well, they’re online, of course. They’re on thousands of web sites. How are you going to find them? Well, sure, you can just launch a campaign on a network of web sites and hope that you’re going to reach your entire target.

However, there’s an easier way. Targeting a tribe is also about understanding a mind-set. A tribe is defined as a “social division of people.” The key word here is social. Social involves so many things. What are people doing? How are they doing it? With whom are they doing it? How often? How long? When? Where? This is starting to sound like an invitation to the best party. That’s the mind-set a marketer should have when thinking about tribes, and that’s why tribal marketing works.

If you start to think about these consumers—Preppies, Techies, Alternatives, and Independents—as tribes, and then think about all of their social activities, you can easily figure out how to reach them. Then you won’t just be bowling in the dark. You will hit your mark every time.

Read more about tribal marketing in Chasing Youth Culture And Getting It Right.