In the two states Sanders lost -- Iowa and Nevada -- young voters turned out much less versus their share of the population (as of the most recent Census estimates) than in New Hampshire. Those aged 18 to 30 are a smaller percentage of the population in New Hampshire than they are in Iowa or Nevada, but they turned out about as much in this year's contests. (There are margins of error on these that are not insignificant, but that's not important at this point.)