revision preference src: A 2013 Pew Research Poll found that 84 % of millennials, born since 1980, who were at that time between the ages of 18 and 32, favored legalizing the use of marijuana. In 2015, the Pew Research Center also conducted research regarding generational identity. <SEP> tgt: A 2013 Pew Research Poll found that 84 % of millennials, born since 1980, who were at that time between the ages of 18 and 32, favored legalizing the use of marijuana. In 2015, the Pew Research Poll also conducted research regarding generational identity.