Age on Other Planets
How old would you be on Mars? Each planet takes a different amount of time to orbit the Sun, so a "year" varies dramatically across the solar system. Mercury zips around in just 88 Earth days, while Neptune takes 165 Earth years for one orbit. Enter your age to discover how many planetary years old you'd be throughout the solar system.
How We Calculate This
Planetary age = (Earth age in days) ÷ (orbital period in Earth days). Orbital periods from NASA Space Place. Earth year = 365.2425 days (Gregorian calendar average).
Frequently Asked Questions
How is planetary age calculated?
Your age in planetary years = (Earth age × 365.25) ÷ planet's orbital period in days. Each planet takes a different time to orbit the Sun, defining its "year."
Why is Mercury age so high?
Mercury orbits the Sun in just 88 Earth days, so you'd have many more "birthdays" there. In one Earth year, Mercury completes over 4 orbits.
How old would I be on Neptune?
Neptune takes about 165 Earth years to orbit the Sun once. Most humans will never complete a single Neptunian year! Only people born before 1859 would have had a Neptune birthday by now.
What about Pluto?
Pluto's orbital period is about 248 Earth years. No human has ever been alive for a complete Pluto year. Pluto has only completed about 1/3 of an orbit since its discovery in 1930.
Related Calculators
You might also find these calculators helpful: Weight on Other Worlds, and Space Travel Time.