As this article explains, voter turnout among youths can be decisive in elections.
But the electoral college system in this century is biased against young voters. Why? Swing states such as Florida, Pennsylvania, Michigan, and Wisconsin, have some of the highest median ages in the country:
The key swing states Florida and Pennsylvania have the first and second highest percentage of residents over the age of 65. Voters in these older states decide the election and the young people everywhere else are taken for granted.