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KCC's Quizzes: Anniversary and Ages in Prime Numbers

In 1979, a mother and her 4 sons are aged 97, 67, 61, 59 and 53 respectively. All these ages and that year are prime numbers.


  1. That “situation” did already happen (prime numbers in the year and in their 5 ages) in the past for that family. When and what were their ages?
  2. That “situation” can occur again in the future (we suppose science will allow us to live much longer than now). When and what will be their ages?
Parents Reply
  • Hi Ralph,

    No, I don't know if there is a mathematic formula giving all the solutions... The official answers I have are one occurence before 1979, one in 1979 and one after 1979...

    And I am interested in the Excel spreadsheet you built to find all the occurences.!

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