And what do you suppose it proves, other than that those just barely emerging into nominal adulthood, with very little real-world experience, tend to be much more idealistic, and much less pragmatic, than those who have been around long enough to know how the world works? I'm reminded of a quote, popularly but probably incorrectly attributed to Winston Churchill, about how a man who is not a liberal when he is young has no heart, but a man who is not a conservative when he is old has no brain. When I was in the 18-24 age group, I was a conservative, even then, but many of my peers were LIbErals, who have since grown up into conservatism; just as most of the current 18-25 age group will surely do by the time they reach my age. It is the difference between people who have not yet known any life other than being fed, housed, and otherwise supported by their parents; and those who have gone out into the world, and experienced the reality of having to earn their own living. Unless you are planning on seeking to establish a maximum voting age, of about 25 or so, the prediction that you think your map is making, it is not.