How old would a 12 year old person be on Ceres?

A 12-year-old person would still be 12 years old on Ceres, as age is measured the same way regardless of location. However, a year on Ceres is significantly longer than a year on Earth, taking about 4.6 Earth years to complete one orbit around the Sun. Therefore, while their age in Earth years remains 12, they would experience a much longer passage of time for each year compared to Earth's calendar.