40 is the new 30, 50 year olds listen to the music their children like... we all know that nowadays, a 44 year old guy could be me (eternal 29) or the oldest dude around. Still, many companies define target groups along with demographics. Netflix says that age and gender cannot be used at all to predict taste (may be pretty important when you design products or create advertising for "target groups"). And Netflix doesn't care about Geography either (but for advertising and marketing, I think, Geography is a different case).
Full feature: http://www.wired.com/2016/03/netflixs-grand-maybe-crazy-plan-conquer-world/