What is it?
Age on Other Planets shows your age in the “years” of Mercury, Venus, Mars, Jupiter, Saturn, Uranus and Neptune.
Who is it for?
Children and students learning about the solar system, teachers making science fun, and space fans.
How to use it
Enter your Date of birth, or tap Try a sample.
Why ages differ
A planet’s year is the time it takes to go round the Sun. Mercury takes 88 Earth days, so you are about four times older there. Jupiter takes almost 12 Earth years, so a 24-year-old is about 2 in Jupiter years. Neptune takes 165 Earth years; nobody has lived one Neptune year yet.
Fun facts for lessons
- A day on Venus (one rotation) is longer than its year.
- On Mars, a year is about 687 Earth days, so birthdays come almost every two Earth years.
- Combine it with the Mass to Weight Calculator to see your weight on each planet too.
Worked example
Someone who is 30 Earth years old is about:
- 124 on Mercury (year of 88 Earth days)
- 49 on Venus (225 days)
- 16 on Mars (687 days)
- 2.5 on Jupiter (11.9 Earth years)
- 1 on Saturn (29.5 Earth years)
- 0.36 on Uranus and 0.18 on Neptune.
Classroom activity
- Each student finds their age on Mars and Jupiter.
- Ask: on which planet would you have the most birthdays? (Mercury, about four a year.)
- Discuss why planets farther from the Sun have longer years: they travel a longer path and move more slowly.
Questions children ask
- Would I really be younger on Jupiter? No, your body ages the same; only the way of counting years changes.
- Where is Pluto? Pluto is a dwarf planet; its year is 248 Earth years.
Related tools
Mass to Weight Calculator (your weight on each planet) · Age Calculator
Errors and how to fix them
- Nothing shows: enter a full date of birth in the past.
Open the tool: Age on Other Planets
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