Space Birthday

Do you know how many Mars years old you are?


If you were born on Mars, how old would you be today? Or how many times has Jupiter gone around the sun since you were born? What's your age in Venusian years? This page can tell you! Enter your and your friends' birthdays using the form below. The information will only be stored on this computer, not on the server, so don't worry! (PS - I also have some printable space birthday worksheets you can download if you want to do these calculations yourself.)

  • Your/your friend's name:
  • Your/your friend's birthday:
You need to enter the year correctly - your Jupiter birthday doesn't fall on the same day each year, in fact most years you don't even have one!

J. K. Rowling's Birthdays

J. K. Rowling became famous for her Harry Potter series of books, after being rejected by eight different publishers. Links: Amazon, Wikipedia, Official Website, Other Celebrity Space Birthdays

 J. K. Rowling turns 95 Venus years old on the 10th January, 2024.
 J. K. Rowling turns 243 Mercury years old on the 8th February, 2024.
 J. K. Rowling turns 2 Saturn years old on the 29th June, 2024.
 J. K. Rowling turns 58 Earth years old on the 31st July, 2024.
 J. K. Rowling turns 5 Jupiter years old on the 16th November, 2024.
 J. K. Rowling turns 32 Mars years old on the 7th October, 2025.
 J. K. Rowling turns 1 Uranus year old on the 26th November, 2049.
 J. K. Rowling turns 1 Neptune year old on the 17th May, 2130.

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