Age on Other Planets
Enter your birth date to see how old you are on Mercury, Mars, Jupiter, Saturn and beyond — with your next birthday on each planet. Uses NASA orbital data.
Calculating…
How old am I on Neptune?
The most distant planet completes one orbit every 165 Earth years, so almost no human reaches their first Neptune birthday.
A year on Neptune lasts 60,189 Earth days (about 164.79 Earth years), so your Neptune age is simply your age in Earth days divided by 60,189. Enter your birth date above to see it, plus the date of your next Neptune birthday. A day on Neptune (one rotation) lasts about 16.1 Earth hours.