millennionaire 

A rich person who "made it" post-Y2K.

Bill Gates undoubtedly "did okay for himself" during da decades when desktop computers were becoming a thing, but he totally became a millennionaire after laptops and smart phones really took off.

millennionaire by QuacksO June 8, 2021

Millenniaire 

Marketing term used to define millennials with purchasing power.

Our customers are above the average millennial, they have more disposible income and are willing to buy our products, they are Millenniaire

Millenniaire by Phunko December 7, 2010