Saturn is the oldest, and tallest. Jupiter is the middle child, and second tallest. Mars is the youngest, and the shortest. All three are only a year appart from each other, Mars is just really short. xD They're all in their early twenties, litterally. Saturn is twenty-two, Jupiter is twenty-one, and Mars is twenty. Saturn takes after their dad in quill style, Jupiter takes after their mom and dad, and Mars takes after their mom.