Millennials are more open than the general population about gender and sexuality. But they've got nothing on Generation Z — those ages 13 to 20 — according to The Innovation Group of marketing communications firm J. Walter Thompson. A study by the group showed that about 56 percent of the younger group know someone who uses gender-neutral pronouns such as "they" or "ze," compared with 43 percent of 28- to 34-year-olds.