Find Out How Old You'd Be on Jupiter, Mars, Venus and Other Planets Using This Nifty Calculator
Author Irene Diomi built a simple calculator using NASA data to estimate and compare one's age on Earth with other planets in the universe. Click on the link below to see what you age is on other planets.
Key Details
One earth year is calculated based on the time it takes to complete one revolution around the sun.
So, “one year” on another planet, for the purposes of this chart, is based on how long one revolution around the sun takes, which depends on how far the planet is from the sun.
— Irene Diomi (@VizWithIrene) July 27, 2021

I am 38.8 years old on Mars (Marsian age)