Aahhh, no. Millenials are based on the decade where they came into adulthood. This means the decade when they turned 18 through 29. Therefore, if you turned 18 for the year 2000, you were born in 1982.
You may not agree, but that is how the generationists figure this stuff.
It doesn’t matter if I agree with those generationists, whoever they are, it’s just another occasion for (weak) jokes and puns, as the very definition of the ‘millenials’ is completely arbitrary, and could instead apply for example to all those who died in the year 2000, don’t you think?