Age on Other Planets
Enter your birth date to see how old you are on Mercury, Mars, Jupiter, Saturn and beyond — with your next birthday on each planet. Uses NASA orbital data.
Calculating…
How old are you in space?
A year is just the time it takes a planet to orbit the Sun once — and every planet takes a different amount of time. So your age changes dramatically depending on where you are: you'd be a sprightly toddler on Saturn but well over a century old on Mercury. Enter your birth date above to see your age on every planet, along with the date of your next birthday on each one.
Jump to a planet
A year on each planet
These are the sidereal orbital periods — one full orbit around the Sun, measured in Earth days — from NASA. Your age on a planet is your age in Earth days divided by this number.
| Planet | Year length (Earth days) | Year length (Earth years) |
|---|---|---|
| Mercury | 87.969 | 0.24 |
| Venus | 224.701 | 0.62 |
| Earth | 365.256 | 1.00 |
| Mars | 686.98 | 1.88 |
| Jupiter | 4,332.589 | 11.86 |
| Saturn | 10,759.22 | 29.46 |
| Uranus | 30,685.4 | 84.01 |
| Neptune | 60,189 | 164.79 |
| Pluto | 90,560 | 247.94 |
Frequently Asked Questions
- How is your age on other planets calculated?
- Your age in Earth days is divided by the length of the other planet's year (its orbital period in Earth days). For example, Mars takes about 687 Earth days to orbit the Sun, so your Mars age is your Earth age in days divided by 687.
- Why am I so much older on Mercury?
- Mercury is closest to the Sun and completes an orbit in just 88 Earth days. Because its year is so short, you accumulate far more Mercury-years — roughly four times your Earth age.
- How old would I be on Mars?
- A Mars year is about 687 Earth days, so your Mars age is a little under half your Earth age. Someone 30 Earth years old is about 15.95 Mars years old.
- What is my next birthday on another planet?
- It's the date when you complete your next whole number of that planet's years. The calculator shows the exact date and how many Earth days away it is for every planet.
- Are these numbers accurate?
- Yes — the orbital periods come from the NASA Planetary Fact Sheet and NASA Space Place. Values are sidereal orbital periods (one full orbit relative to the stars) in Earth days.