I was born in 1984 and hate to be lumped together with people born in the 90s. There's a firm divide between the two decades.
That's the thing that gets me about marketing too. (Im a web designer)
All these ad agencys and marketing firms have lumped their targets wrong and still don't really have an idea who the millenials are and don't get why they can't reach their audience. It's kind of ridiculous