Planet Age Calculator
See your equivalent age on every planet in the solar system, based on orbital period.
How This Works
A "year" on any planet is the time it takes to complete one orbit around the sun. Mercury zips around in just 88 Earth days, so you'd rack up "birthdays" much faster there — while a year on Neptune takes about 165 Earth years, so most people will never live to see even one.
Formula
Example
A 36-year-old on Earth would be about 149 years old on Mercury (0.24-year orbit), but only about 3 years old on Jupiter (11.86-year orbit).
Frequently Asked Questions
How old would someone born May 14, 1990 be on Mars?
About 19.28 Mars years old (Mars orbits the sun in about 1.88 Earth years).
Why does age vary so much between planets?
Because each planet's "year" is a different length — planets closer to the sun orbit faster (shorter years, so you age in more planet-years), while planets farther out orbit much more slowly (longer years, so you age in far fewer planet-years).