Your age on each planet
Pick a date of birth to see your age on each planet and your next birthday there.
| Planet | Your age | Next birthday |
|---|
Length of a year on each planet
| Planet | Year length | In Earth years | Age if 30 on Earth |
|---|---|---|---|
| Mercury | 88 days | 0.24 Earth years | 124.52 |
| Venus | 225 days | 0.62 Earth years | 48.77 |
| Mars | 687 days | 1.88 Earth years | 15.95 |
| Jupiter | 4,331 days | 11.86 Earth years | 2.53 |
| Saturn | 10,747 days | 29.42 Earth years | 1.02 |
| Uranus | 30,589 days | 83.75 Earth years | 0.36 |
| Neptune | 59,800 days | 163.72 Earth years | 0.18 |
| Pluto | 90,560 days | 247.94 Earth years | 0.12 |
Earth's year is 365.2 days. Mercury orbits in 88 days, so it has about four birthdays for each one on Earth. Neptune takes 164 Earth years to go round once, longer than any recorded human lifespan, so no one has ever been a year old there.
A year is one trip around the Sun
A planet's year is the time it takes to go around the Sun once, so your age in planet years is the number of laps you have completed. Mercury is closest to the Sun and moves fastest, finishing a lap in 88 days, so it has about 4.2 birthdays for each one on Earth. Mars takes 687 days, almost 1.9 Earth years. Jupiter takes 11.9 Earth years, Saturn 29.4 and Uranus 84.
The length of each year is explained in how long a year lasts on each planet.
Neptune is still celebrating its first birthday
Neptune was discovered in 1846 and completed its first 165-year orbit since then in 2011, according to NASA. Someone born on Earth the day Neptune was found would have been 165 Earth years old in 2011, and one year old on Neptune. The planet is covered in Neptune.
Pluto hasn't finished one lap since it was found
Pluto was discovered in 1930 and its orbit takes 248 years, so it won't return to the place where it was first seen until about 2178. Its path is an oval, so it moves faster when it is closer to the Sun. Pluto is now called a dwarf planet, but the calculator includes it because the question comes up so often.
Planet years and seasons
A planet year isn't a cycle of seasons. Seasons come from a planet's tilt, not from the length of its year, so Venus, with a year of 224.7 Earth days, tells you nothing about its weather. See planet tilt and seasons for how it works. The calculator counts every planet year as an exact number of Earth days from the NASA fact sheet, and it uses a 365.25-day Earth year, so your age on any planet is correct to within a day or two.
A worked example: someone aged 40
Take a person who has lived 40 Earth years, which is 14,610 days. Divide by each planet's orbital period from the fact sheet and the ages come out as: Mercury 166.0, Venus 65.0, Mars 21.3, Jupiter 3.4, Saturn 1.4. The same person hasn't yet reached one year on Uranus or Neptune, because those years last 84 and 164 Earth years.
What the calculator doesn't do
It answers one question: how many laps has each planet made while you have been alive. It doesn't say how a day feels, because a day on Venus is longer than its year, or what the seasons are like. For day lengths see how long a day lasts on each planet.
A child's view
A ten-year-old has lived 3,652 days. That's 42 years on Mercury, 16.3 on Venus and 5.3 on Mars. On Jupiter the same child hasn't reached a first birthday: 0.84 of a year, so its first birthday there comes in 1.9 Earth years. Saturn is slower still, with 29.4 Earth years to a lap.