Millennials make up about a quarter of Colorado’s population. It is the generational cohort aged today about 25 to 40 (there are several competing definitions), and they are Colorado’s largest, overtaking Baby Boomers, which has been the largest since they came of age in 1964 (the cohort began in 1946). But, they are not sending in their ballots for the November 5 election. Thus far, only 39,100, or 10 percent, of those who voted as of Monday, October 28, were Millennials, whereas more than half are Baby Boomers (55-74). Another 2 percent were Generation Z (18 to 25 years old).