How old would you be if you lived on Saturn and was12?

If you were 12 years old on Earth and lived on Saturn, you would still be 12 years old in terms of your age; age is a measure of the time you've been alive, regardless of the planet. However, a year on Saturn lasts about 29.5 Earth years, so if you were to measure your age in Saturn years, you would be less than half a year old, as you would have only completed a fraction of one Saturn year.