How Old Is Rimuru Tempest in Steins Gate

Let's cut right to the chase: if you're searching for "how old is Rimuru Tempest in Steins Gate," there's an important clarification we need to make first. Rimuru Tempest, the beloved protagonist who began life as a human and reincarnated as a slime, does not exist within the universe of Steins Gate. His adventures unfold exclusively in the immensely popular Isekai series, That Time I Got Reincarnated as a Slime (also known as TenSura)....