18-49-year-old-youtube-behavior

During prime-time hours of an average day in the U.S., more 18- to 49-year-olds visit YouTube than any TV network, even on mobile alone.

Google-commissioned Nielsen study. Average daily primetime audience, aged 18–49, for YouTube Mobile, Nielsen Mobile Panel. All individual cable and broadcast networks during primetime, reach of 18+ (live + 7, one-minute qualifier), TV only, Sept. 2016.