On Earth, one year equals one complete orbit around the Sun — approximately 365.25 days. But on other planets, a year is an entirely different length of time. If you were transported to another planet today, how old would you be by that planet's standards?
Mercury completes an orbit of the Sun in just 88 Earth days. That means a Mercury year is less than three Earth months long. If you are 25 years old on Earth, you would be approximately 103 years old on Mercury. Everyone who visits Mercury becomes a centenarian instantly.
Venus takes 225 Earth days to orbit the Sun. A 25-year-old Earth person would be roughly 40 years old on Venus — significantly older, but not dramatically different from Earth age.
Mars takes 687 Earth days to complete its orbit. A 25-year-old on Earth would be approximately 13 years old on Mars — barely a teenager. Mars is where everyone gets to feel young again.
Jupiter takes nearly 12 Earth years to orbit the Sun. A 25-year-old on Earth would be roughly 2 years old on Jupiter — still in nappies, cosmically speaking.
Neptune takes a remarkable 165 Earth years to orbit the Sun. No human being has ever lived long enough to celebrate even a single birthday by Neptunian standards. The oldest verified person in history — at 122 years — would not even be 1 year old on Neptune.
Our Age Calculator tells you your exact Earth age. The planetary ages above are calculated by dividing your Earth age by the planet year length relative to Earth.