Youth vote in the United States
The youth vote in the United States is a political term used to describe 18- to 24-year-olds and their voting habits. Many policy areas specifically affect the youth of the United States, such as education issues and the juvenile justice system. The general trend in voter turnout for American elections has been decreasing for all age groups, but "young people's participation has taken the biggest nosedive". This low youth turnout is part of the generational trend of voting activity. Young people have the lowest turnout, though as the individual ages, turnout increases to a peak at the age of 50 and then falls again. 
Ever since 18-year-olds were given the right to vote in 1972, youth have been under represented at the polls. In 1976, one of the first elections in which 18-year-olds were able to vote, 18-24 year-olds made up 18 percent of all eligible voters in America, but only 13 percent actually voted - an under-representation of one-third. In the next election in 1978, youth were under-represented by 50 percent. "Seven out of ten young people…did not vote in the 1996 presidential election… 20 percent below the general turnout". In 1998, out of the 13 percent of eligible youth voters in America, only five percent voted. During the competitive presidential race of 2000, 36 percent of youth turned out to vote and in 2004, the "banner year in the history of youth voting," 47 percent of the American youth voted. Recently, in the 2008 U.S. Presidential election, the number of youth voters tripled and even quadrupled in some states compared to the 2004 elections.
United States presidential election
Voter turnout in the 2004 and 2008 elections showed a noticeable increase over the turnout in 1996 and 2000. Prior to 2004, voter turnout in presidential elections had been decreasing while voter registration, measured in terms of voting age population (VAP) by the U.S. Census, has been increasing. The VAP figure, however, includes persons ineligible to vote – mainly non-citizens and ineligible felons – and excludes overseas eligible voters. Opinion is mixed on whether this decline was due to voter apathy. or an increase in ineligible voters on the rolls.
The difference between these two measures are illustrated by analysis of turnout in the 2004 and 2008 elections. Voter turnout from the 2004 and 2008 election was "not statistically different," based on the voting age population used by a November 2008 U.S. Census survey of 50,000 households. If expressed in terms of vote eligible population (VEP), the 2008 national turnout rate was 61.7% from 131.3 million ballots cast for president, an increase of over 1.6 percentage points over the 60.1% turnout rate of 2004, and the highest since 1968.