Age on Other Planets
Based on orbital periods around the Sun
years
Your Age Across the Solar System
Ad · 728×90
Space Age Questions
How is age on other planets calculated?+
Each planet takes a different amount of time to orbit the Sun — this is its "year." Your age on another planet = your Earth age in days ÷ that planet's year in Earth days. For example, a Mars year is 687 Earth days, so you divide your age in days by 687 to get your Mars age.
How long is a year on Mars?+
A Martian year is 686.97 Earth days — about 1.88 Earth years. This means a 30-year-old on Earth is about 15.9 years old in Martian years. Mars also has a slightly longer day (24 hours 37 minutes vs Earth's 24 hours), so days are similar but years are much longer.
Why is Mercury age so much higher?+
Mercury orbits the Sun very quickly — a Mercury year is only 88 Earth days. So you experience many more "years" on Mercury for the same amount of Earth time. A 30-year-old on Earth has lived through about 124 Mercury years. Despite being close to the Sun, Mercury's days are very long (about 59 Earth days).
How old would I be on Neptune?+
Neptune takes 164.8 Earth years to complete one orbit. This means anyone alive today has not even lived through one complete Neptune year — and neither did their parents or grandparents. A 30-year-old on Earth is only about 0.18 Neptune years old. Neptune completed its first full orbit since discovery only in 2011.