* Age is a measure of time passed on Earth. We measure age based on the time it takes Earth to complete one orbit around the sun (a year).
* Jupiter has a much longer year. It takes Jupiter approximately 12 Earth years to complete one orbit around the sun.
So, if a person is 10 years old on Earth, they would still be 10 years old on Jupiter.
Age is a personal experience of time, and it doesn't change based on your location in the solar system.