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Why in 2018 ?

1970s1970s Posts: 3,093 ✭✭✭✭✭

Why in 2018 can everyone add their age to their birth year and it always comes out to 2018 ?

Any math wizards out there who can explain this ?

Comments

  • TitusFlaviusTitusFlavius Posts: 321 ✭✭✭

    Because for anyone born in the AD era, the age they will turn in the current year is equal to: current year minus birth year. Therefore, birth year + age on birthday in current year will always equal the current year. Your statement, as written, isn't true for someone who hasn't reached their birthday in 2018 yet.

    To keep it coin related, happy belated 140th to the Morgan dollar!

    "Render therfore unto Caesar the things which are Caesar's; and unto God the things that are God's." Matthew 22: 21
  • mustangmanbobmustangmanbob Posts: 1,895 ✭✭✭✭✭

    Doesn't work for

    1) People whose birthdays are later in the year than today.
    2) People born on Feb 29
    3) People, who for various reasons, do not have a birth year that corresponds to their birth age year. For example, my birth year is recorded 2 years and several day different from my "arrival" in the world.

  • Aspie_RoccoAspie_Rocco Posts: 3,854 ✭✭✭✭✭

    You are adding a previously subtracted number.

    Any time you add your age to your birth year you will find the current year.
    2000+18=2018
    2018-18=2000

  • rickoricko Posts: 98,724 ✭✭✭✭✭

    Works for me....and I would believe anyone that was 'born'...and recorded correctly. Cheers, RickO

  • TwoSides2aCoinTwoSides2aCoin Posts: 44,710 ✭✭✭✭✭
    edited October 9, 2018 2:35PM

    I hate the new math.

  • ZoinsZoins Posts: 34,401 ✭✭✭✭✭
    edited October 8, 2018 7:40AM

    Here's some math to support this:

    Age = Current Year - Birth Year

    Add Birth Year to both sides

    Age + Birth Year = Current Year - Birth Year + Birth Year

    Birth Year on right side cancels each other out to result in "+0"

    Age + Birth Year = Current Year + 0

    Removing extraneous "+0" results in:

    Age + Birth Year = Current Year

    Next year, adding your age to your birth year will be 2019 ;)

  • david3142david3142 Posts: 3,635 ✭✭✭✭✭

    @mustangmanbob said:
    Doesn't work for

    1) People whose birthdays are later in the year than today.
    2) People born on Feb 29
    3) People, who for various reasons, do not have a birth year that corresponds to their birth age year. For example, my birth year is recorded 2 years and several day different from my "arrival" in the world.

    Where is it recorded that your birth year is not when you were born?

  • mustangmanbobmustangmanbob Posts: 1,895 ✭✭✭✭✭

    @david3142 said:

    @mustangmanbob said:
    Doesn't work for

    1) People whose birthdays are later in the year than today.
    2) People born on Feb 29
    3) People, who for various reasons, do not have a birth year that corresponds to their birth age year. For example, my birth year is recorded 2 years and several day different from my "arrival" in the world.

    Where is it recorded that your birth year is not when you were born?

    I have 3 birth certificates with 3 different days and 3 different years. I asked out it one time, and was told to leave it alone.

    So I use the youngest one.

  • ashelandasheland Posts: 24,076 ✭✭✭✭✭
  • ashelandasheland Posts: 24,076 ✭✭✭✭✭
  • OverdateOverdate Posts: 7,205 ✭✭✭✭✭

    @mustangmanbob said:
    Doesn't work for

    2) People born on Feb 29

    It does work if the current date is March 1 or later.

  • cameonut2011cameonut2011 Posts: 10,181 ✭✭✭✭✭

    @mustangmanbob said:

    @david3142 said:

    @mustangmanbob said:
    Doesn't work for

    1) People whose birthdays are later in the year than today.
    2) People born on Feb 29
    3) People, who for various reasons, do not have a birth year that corresponds to their birth age year. For example, my birth year is recorded 2 years and several day different from my "arrival" in the world.

    Where is it recorded that your birth year is not when you were born?

    I have 3 birth certificates with 3 different days and 3 different years. I asked out it one time, and was told to leave it alone.

    So I use the youngest one.

    How?

  • Namvet69Namvet69 Posts: 9,322 ✭✭✭✭✭

    Abbott and Costello said it best in their routine of 7 times 13 equals 28. Watch it on YouTube it's a classic. Peace Roy

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  • johnny9434johnny9434 Posts: 29,890 ✭✭✭✭✭

    i quit figuring that way. i dont like the numbers. just saying

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