How Old Is Rukia Kuchiki in Steins Gate

If you've landed here looking for information on Rukia Kuchiki's age within the world of Steins;Gate, there's an important clarification to make right away. Rukia Kuchiki is a beloved character from Tite Kubo's highly popular manga and anime series, Bleach. She is not, however, a character who appears in the science fiction thriller Steins;Gate. It seems there might be a common mix-up between character names or series, which is totally understandable given the vast landscape of anime and manga!...