Popsugar Entertainment Roseanne Tv Show How Old Is the Cast of Roseanne? Age Investigation: How Old Is the Cast of Roseanne? 28 March 2018 by Andrea Reiher View On One Page Photo 8 of 10 ADVERTISEMENT () Start Slideshow Share This Link Copy ← Use Arrow Keys → 8 Ames McNamara as Mark Conner-Healy Age: ~12 Birthday: Unknown Previous Next Start Slideshow Roseanne TV ShowTV