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A year on Mars lasts 687 Earth days. Do a little math - 365/687=53%.

53% of 10 is 5.3 years old or 5 years 109.5 days old.

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If you want to use Mars years, you should also use Mars days for your final answer.

10 Earth years = 5.316886 Mars years.

The Mars solar day is 1.027491 Earth solar days.

Converting to Mars solar days, 0.316886 Mars years would be 217.7 Earth-days (not 109.5 days) or 211.9 Mars-days

So in Martian years and days, someone who is exactly 10 Earth Years old would be 5 Mars-years, 212 Mars-days old.

(remember the .3 in the 5.3 "years" is Mars-years, not Earth years so you have to multiply it by 687 Earth-days, not 365 Earth-days)

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13y ago

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