Okay I need a ruling on this: is Henry Cavill a millennial? Born May 5, 1983

absolutely yes, he's younger than i am and i'm a millennial

Pretty sure yeah, he's just an older one

Anyone older than 1980 is considered millinial

Yes. But also Xennial really, there’s a range where it blends. en.m.wikipedia.org/wiki/Xennials

Yes but I often see 1980-6 called "Xennials" also.

Yes. I'm an "Elder Millennial" (born June 1981), although the cusp between Gen X (ended 1980) and Millennial (starts 1981) is sometimes refered to as the "micro generation" "Xennials," as we had both an analogue and digital childhood. We grew up as things were shifting to computers & Internet.