How old is Mist? This image appears in the gallery:6 Facts You Need To Know About 'Diamond In The Dirt' Rapper Mist 4. How old is Mist? Mist was born on 2nd March 1993 - making the Birmingham rapper currently 24-years-old. 5 images See the full gallery: 6 Facts You Need To Know About 'Diamond In The Dirt' Rapper Mist