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How Old Are You on Other Planets?
Enter your age and find out how old you would be on each planet in the solar system.
Why do we have a different age on each planet?
A year is not the same on every planet. What we call "a year" is the time it takes a planet to complete one full orbit around the Sun. On Earth that is 365 days. On Mercury, the closest to the Sun, only 88 days. On Neptune, the most distant, no less than 60,000 days — more than 164 Earth years.
| Planet | Length of its year | Your age if you are 30 on Earth |
|---|---|---|
| ⬛ Mercury | 88 days | ~124 years |
| 🟡 Venus | 225 days | ~49 years |
| 🔴 Mars | 687 days | ~16 years |
| 🟠 Jupiter | 4,333 days (~12 years) | ~2.5 years |
| 🪐 Saturn | 10,759 days (~29 years) | ~1 year |
| 🔵 Uranus | 30,687 days (~84 years) | ~0.36 years |
| 💙 Neptune | 60,182 days (~165 years) | ~0.18 years |
Planet curiosities
- On Mercury you accumulate years so fast that someone who is 30 on Earth would already be a 124-year-old Mercurian elder.
- On Neptune, no living human would yet have reached their first Neptunian birthday — the planet took 165 years to complete its first orbit since it was discovered in 1846.
- Saturn has almost exactly one Saturnian year for every 29 Earth years. If you are 29, you have just had your first Saturnian birthday!
- Curiously, a day on Venus (its full rotation) lasts longer than a year on Venus (its orbit). It is the only planet with this peculiarity.
Frequently asked questions
Why do we have a different age on each planet?
Because each planet takes a different amount of time to orbit the Sun. A Martian year lasts 687 Earth days and a Mercurian year only 88.
On which planet would you be oldest?
On Mercury, which has the shortest year (88 days). At 30 on Earth you would be over 124 on Mercury.
On which planet would you be youngest?
On Neptune, whose year lasts 165 Earth years. At 30 on Earth you would barely be 0.18 Neptunian years old.