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Math Help - Your not in your 20's until your 21.....Prove it?

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    Your not in your 20's until your 21.....Prove it?

    Q. How does one prove that your not in your 20's until your 21? Now I would have thought that numbers run from 1-10 would be enough proof. But, what I'm up against are people that say that once you hit your 20th b'day then the next day that person is 1 day into their 21st year of life and therefore are in your 20's on your 20th birthday.
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    Quote Originally Posted by diceman1 View Post
    Q. How does one prove that your not in your 20's until your 21? Now I would have thought that numbers run from 1-10 would be enough proof. But, what I'm up against are people that say that once you hit your 20th b'day then the next day that person is 1 day into their 21st year of life and therefore are in your 20's on your 20th birthday.
    There was a great debate about when the twenty-first century actually began.
    It began on January 1, 2001.
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    Thank you for that, is that evidence for or against me though? Must be for me. Head is spinning!
    Last edited by diceman1; May 12th 2011 at 02:34 PM.
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    I also like the fact that the 20th Century ended on 31st Dec 2000 and not 1999, which means during 2000 we did not experince the 21st Century as it hadn't started yet.
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    you are basically asking a semantics question rather than a maths one. Start by defining "in your twenties" then start counting

    if i chose how everything worked, i would make "in your twenties" mean "in your 20th or 21st or ..... or 29th year of life", which would make you between 19 and 28... but i dont think my view is very popular
    Last edited by SpringFan25; May 13th 2011 at 01:38 PM.
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