Your Age on Other Planets
See how old you'd be on Mercury, Mars, Jupiter, and every other planet in the solar system.
Your age on Earth
—years
- Mercury
- —
- Venus
- —
- Mars
- —
- Jupiter
- —
- Saturn
- —
- Uranus
- —
- Neptune
- —
Next birthday on each planet
A year on each planet is the time it takes to orbit the Sun once. We divide the number of Earth days you've lived by each planet's orbital period, so a year passes fastest on Mercury and slowest on Neptune.
- Mercury
- —
- Venus
- —
- Mars
- —
- Jupiter
- —
- Saturn
- —
- Uranus
- —
- Neptune
- —
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How to use it
- 1
Enter your birth date
Pick your date of birth from the calendar field.
- 2
See your Earth age
Your age in Earth years and total days lived is calculated instantly.
- 3
Explore the planets
Each planet card shows your age in that world's years and your next birthday there.
Perfect for every need
Learning & classrooms
A fun way to teach orbital periods and how a year differs from planet to planet.
- Space lessons
- Science fairs
- Homework help
Kids & curiosity
Discover you're only a toddler on Jupiter but ancient on Mercury.
- Mercury years
- Jupiter age
- Neptune birthdays
Fun facts & sharing
Grab a surprising number to share with friends and family.
- Age on Mars
- Party trivia
- Social posts
Frequently asked questions
How is my age on another planet calculated?
We count how many days you've lived on Earth, then divide by the number of Earth days it takes that planet to orbit the Sun once. That orbital period is one year on that planet.
Why am I so much older on Mercury?
Mercury races around the Sun in just 88 Earth days, so it completes many orbits in your lifetime. Neptune takes about 165 Earth years, so you'd be less than one Neptune year old.
How accurate are these numbers?
They use each planet's average orbital period, so they're accurate to a small fraction. Real orbits vary slightly, but the results are close enough for learning and fun.