How old is a 40 year old man on another planet

How old is a 40 year old man on another planet
You've been celebrating Birthday since you were born and you can definitely say how old you are in about a second, right? But how old would you be on Mars and other planets of our Solar System? A year on Mars is almost twice as long as that on Earth. Let's see on which planet you'll age the slowest and the fastest!
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