Estimate model
It first derives elapsed Earth days from your birth date, then divides by approximate orbital periods for Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus and Neptune.
🪐 AGE ON PLANETS
How old are you on Mars?
Your age changes wildly depending on the planet.
Your planetary ages
ASSUMPTIONS & INTERPRETATION
Age on Other Planets
Your elapsed lifetime stays the same; this tool only changes the definition of a “year” by using each planet’s orbital period around the Sun.
What the number means
A smaller numerical age means that planet has a longer year. A larger numerical age means its orbit is shorter than Earth’s.
Worked example
Around 30 Earth years corresponds to roughly 16 Martian years, while the same elapsed time contains many more Mercurian years.
Good to know
Why your Mars age is different →Orbital values are educational averages, not precision ephemerides, and planetary age is not a claim about biological ageing.
Astronomy source note
Orbital periods are educational averages. NASA Science describes a Mars year as 687 Earth days; JPL publishes planetary orbital parameters.
NASA Mars facts ↗JPL parameters ↗