The Pew Research Center defines millennials as people born between 1981 to 1996 who are now 23 to 38 years old. According to the Census Bureau, millennials consist of 83.1 million people in the United States. They also contribute to 21% of end-user discretionary purchases, which are anticipated to exceed one trillion dollars per year. Because they tend to be environmentally conscious, millennial consumer trends are going to play a significant role in changes on the planet.