Solar System Age
Enter your birth date and discover how old you are on every planet in the solar system — then see just how vanishingly small your existence looks from a galactic scale.
How old are you on Neptune?
Enter your birth date to discover your age across every planet in the solar system — then see just how small your existence looks from a galactic scale.
The Solar System Age calculator converts your Earth age into planetary years across all eight planets. You may be over 100 Mercury years old, barely one Saturn year old, and have completed an almost imperceptibly tiny fraction of a galactic year.
How to Calculate Your Planetary Age
- Enter your date of birth in the input field. The calculator accepts any date from 1900 to today.
- Click Reveal My Cosmic Age to instantly see your age in Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune years.
- Scroll down for galactic and cosmic perspective — your age as a fraction of the universe's life, light-years traveled with the Sun through the galaxy, and more.
Frequently Asked Questions
How is my planetary age calculated?
Each planet has a different orbital period — the time it takes to complete one full orbit around the Sun. Your age in Earth years is divided by that planet's orbital period to give your age in that planet's years. Mercury's period is 0.24 Earth years; Neptune's is 164.8 Earth years.
Am I really over 100 years old on Mercury?
Yes. Mercury orbits the Sun in just 88 Earth days — about 0.24 Earth years. A 25-year-old has lived through roughly 104 Mercury years. A 1-year-old baby has already celebrated over 4 Mercury birthdays.
What does the galactic year calculation mean?
The Sun takes approximately 225 million Earth years to complete one orbit around the Milky Way's centre — called a galactic year or cosmic year. Even a 100-year-old human has completed less than 0.00000045% of one galactic year.
How far have I traveled through space?
The Sun moves at roughly 251 km/s through the galaxy, carrying Earth — and you — along with it. A 30-year-old has traveled approximately 25 light-years through the galaxy since birth. That is the distance light takes 25 years to cross.