Castor and Pollux (Gemini) never interacted with Ganymede (Aquarius) however, they were actually both alive in the same time period. What I mean is that, Aquarius and Gemini were both humans at the same time but never met each other.
Before Castor and Pollux became a star, they were about 19-20 years old. Ganymede was probably... 15 years of age.
Gemini is most likely the second youngest of the zodiac.
P.S. Ganymede represents as a symbol of homosexuality (That's why Aqua is the first sign to be gay) and he's also the most beautiful among all mortals (According to what I read... But of course, you can't believe EVERYTHING.)
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The Zodiac Mission: Arts and Facts
RandomAn extra book of my Zodiac series: The Zodiac Mission Warning: Spoilers for all four books of the TZM series are within this book. Be careful on what you read if you don't like spoilers. (Some art may be spoilers too)