Age on Other Planets
Find your age in the years of other planets.
How old are you on Mars?
A year is one trip around the Sun, and every planet takes a different amount of time to make it. That means your age, measured in each planet’s years, changes dramatically across the solar system.
Enter your birth date and it finds your Earth age, then divides by each planet’s orbital period. You are a middle-aged human but barely a toddler in Saturn years, and not even one Neptune year old.
Playful and private
The calculation runs in your browser, so your birth date is never uploaded.
Frequently Asked Questions
How is planet age calculated?
Your age in Earth years is divided by each planet’s orbital period, the time it takes to circle the Sun once.
Why am I younger on outer planets?
Because their years are much longer. Neptune takes about 165 Earth years to orbit once, so you have lived only a fraction of one Neptune year.
Is my birth date stored?
No. It is used only in your browser to compute your Earth age.
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