Blue, White, & Black dwarfs and the Star Frontiers setting

I was reading up on blue dwarf stars specifically and its said these are only theoretical as the universe is not old enough for a red dwarf to evolve into a blue dwarf let alone the white and black stages of a red dwarf's life cycle.<div><br /></div><div>AD disconnects the setting from the Milky Way; so can we not imagine the setting in this universe to be old enough to contain blue dwarfs?</div><div><br /></div><div><br /></div>