I see what you're saying, and would not disagree with it in the least. The masses of young people are, just as the masses in all demographics, fairly mainstream and conventional and yes, they even tend strongly Democratic.
I was just referring to the much smaller universe of our movement, the liberty movement. It is a growing movement. New people are coming into it. The older people in it, yes, they often are Constitutionalists or old-right conservatives. The new young people, on the other hand, while they may start out Consties or conservies, almost always eventually find their way to Austrian Economics and a more radical brand of libertarianism. This is unsurprising, as youth seem to be historically, perhaps naturally, more idealistic and radical in their political opinions than their elders. The visions of Bill Buckley or Alexander Hamilton just aren't compelling to them. Milton Friedman or Barry Goldwater's visions... perhaps a little more so, but still not there yet. Murray Rothbard, L. Neil Smith, the Tannehills? Now you're talking. Young people want a powerful vision for a bright and exciting future, not merely a pining for an old document or a regurgitation of the ideas of the past.
So hopefully I have communicated my meaning to you more successfully this time. Within the relatively small community of liberty-oriented Americans, it appears that the more moderate positions of Constitutionalism, conservatism, even minarchism, are concentrated in the older generations and thus desined to die out, while the more radical position of anarchocapitalism/voluntarism/free-marketeer-ism is concentrated in the younger generation and thus destined to dominate. What's more, intellectually, the more moderate positions simply don't have a leg to stand on. The great libertarian scholars today, save a very few (Tibor Machan comes to mind), are all ancap.
Taxonomy is one of the great acheivements of modern science. To reject it would be tragic. We should, and I do, deal with others as unique individuals. Nevertheless, "labels" as you call them, are efficient, effective, and immensely valuable tools to quickly define aspects of our individuality to others. Yes, I am ancap. Just think of all the information about my political ideas I've communicated to you with that one five-letter word. I am American. That tells you something about my geographical location, the cultural mileu in which I have likely grown up, etc. I am Mormon. That tells you, aha, some of the assumptions about my cultural background that would be true of most Americans are not true of me. I can communicate vast volumes of information about myself, to the informed and literate, by using "labels" as you call them to define my ideas, habits, and associations. "Labels" help us understand each other as individuals. Without "labels", we all just fall under one vast collectivistic label: human.