Learn how to calculate your age on different planets.
How old are you right now? That age is going to be fairly integral to who you are as a person and how you identify yourself. They say that age is just a number; indeed, that number is completely different depending upon which planet you reside.
Sure, you might spend your entire life standing only on Earth, but as more and more people become terraformers and settlers of different planets, their ages will become more and more varied. In fact, you might have children older than you and grandparents that are younger! This is especially true if you’re all spread across the whole solar system.
Physically, your body will have spent the same amount of time existing — that’s a constant. But if you calculate your age based on days, or rotations of your planet’s axis, then you’ll find that the number is very different depending on where you call home. The same goes for if you calculate your age in years or the time it takes for your planet to revolve once around the Sun.
Because of this, it’s worth referring to your age in Earth years or Earth days. If we move or were to live on another planet within our solar system, our ages would be completely different. This is down to the amount of time that it takes for the planet to orbit the sun and for each planet to revolve on its axis.
In order to calculate your age on different planets, there’s a specific calculation that you can complete. Thankfully, you don’t need to be a rocket scientist to make these calculations. First, we calculate our age in days on Earth. Let’s say, for instance, that you’re exactly 25 years old — that’s 9,125 days. You’ll then take this information and put it into a new formula dependent on which planet you’d like to live on.
Here’s a handy table with the formulas in place:
| Planet | Orbit time | Age Formula |
| Mercury | 88 Days | Earth Days / 88 |
| Venus | 225 Days | Earth Days / 225 |
| Mars | 687 Days | Earth Days / 687 |
| Jupiter | 11.8 Years | Earth Days / 4,307 |
| Saturn | 29.4 Years | Earth Days / 10,731 |
| Uranus | 84 Years | Earth Days / 30,660 |
| Neptune | 164 Years | Earth Days / 59,860 |
| Pluto | 248 Years | Earth Days / 90,520 |
Let’s take a group of people on Earth: Penny, Rich and Hayley. Penny is 35, Rich is 42 and Hayley is 56. Through a program of terraforming and planetary exploration, each of them have been posted to different parts of the solar system. Penny has been sent to Neptune, Rich to Mars, and Hayley to Mercury. Based on their new planets their new ages are now:
Penny (Earth Age 35): Neptune Age – 0.21 Years Old; a mere baby.
Rich (Earth Age 42): Mars Age – 22.31 Years Old; nearly 20 years younger.
Hayley (Earth Age 56): Mercury Age – 232.27 Years Old; well over two centuries old!
As you can see, heading for other planets will have a severe aging process… well, only in number. Physically, you’ll still be as old as you were on Earth.
How old are you on your favourite extra-terrestrial world?