Age on Other Planets
Your age on another planet depends on how long that planet takes to orbit the Sun. A year on Mercury lasts just 88 Earth days, while a year on Neptune takes almost 165 Earth years.
Enter your date of birth to see your age on each planet.
Other age tools
About this tool
Your age on another planet depends on how long that planet takes to orbit the Sun. A year on Mercury lasts just 88 Earth days, while a year on Neptune takes almost 165 Earth years. For your exact age in years, months and days use the age calculator. Related tools: date calculator, time calculator, day of the week, event countdowns.
Frequently asked questions
How is age on another planet calculated?
Divide your age in Earth days by the length of the planet's year, also expressed in Earth days. For example, Mars takes about 687 Earth days to orbit the Sun, so you would be roughly half your Earth age on Mars.
On which planet would I be oldest?
Mercury, because its year is the shortest — about 88 Earth days — so you complete far more orbits. You would be youngest on Neptune, whose year lasts nearly 165 Earth years.
Do the gas giants have a surface?
No. Jupiter, Saturn, Uranus and Neptune have no solid surface; the figures here describe orbital age, not a place you could stand.