Find your age on other planets
A Mercury year is 88 days — you're centuries old there, and barely a toddler on Neptune.
Tools used in this guide
The job
Planets' years differ wildly — Mercury's 88 days to Neptune's 165 Earth years. Your 'age' on each is just Earth-days-lived divided by its year length, and the next birthday is when it ticks over.
Birth date and planet
Enter your birth date and pick a planet (or read them all). The result is completed planet-years plus the Earth date of your next planetary birthday.
Worked example
Born Jan 1, 1990: on Mercury (87.97-day year) you're ~150 Mercurian years old, on Mars (687 days) ~19, on Jupiter ~3 — and Neptune won't have finished even one year yet.
Where it stops
Year lengths are mean values — elliptical orbits make real planetary birthdays drift slightly. Ages below one year show as zero with a distant first birthday.