In September 2019, a social media post shared the following math meme, claiming that a numerical rarity in 2019 made it so that “all the people are the same age,” and that no one could explain the anomaly:
What appeared to be a literal screenshot (as in, it was a photograph of a screen) displayed the following text:
All the people in the world are of the same age this year! It’s amazing: this year all the people in the world are in the same age group, all equal to 2019. This year is special. It happens only once every 1,000 years. This year your age + your year of birth, each individual is = 2019. For example, you are 55 years old and you were born in 1964, which adds up to 2019. Very strange, even the Chinese and foreign masters can not explain. Please calculate and see if the answer is 2019. It’s a thousand-year wait! Good shot! Go to the circle of friends, let everybody calculate it!
Thousands of people shared the post, suggesting that they performed the mathematical function in question (birth year + age = 2019) and validated the claim themselves.
On the surface, it works. A person born on June 5 1989 was 30 as of September 2019 (when the meme was posted), and 1989 + 30 = 2019. A person born on March 10 1999 was 20 in September 2019, and 1999 + 20 = 2019. And a person born on April 17 1954 was 65 in September 2019; 1954 + 65 = 2019.
It seems impressive, as by the ninth month of the year, the majority of people have already had a birthday. But iterations of the “birth year + age equals the current year” only happening every thousand years circulated earlier in 2019 and in 2018 (on December 18) as well:
Today is a very special day.
It happens only once every 1,000 years
Your age in years + your year of birth = 2018.
This is true for everyone.
It will not happen again for another 1,000 years.
— Lainey Boggs (@_LaineyBoggs_) December 18, 2018
It's amazing this year that all the people in the world are all in the same age group and all equal to 2019. It happens only once every 1,000 years. Your age + your year of birth = 2019.
— Mauler (@MaulerMauler) August 9, 2019
Before that, in 2017:
Strange but true! But how? pic.twitter.com/rZTY1L1EF9
— Rishi Kapoor (@chintskap) July 16, 2017
It shows up as far back as 2011, albeit with slightly different math:
"Get the last 2 digits of your birth year & your age this year… then add. It should give you 111. Happens every 1,000 years." Pretty cool!
— Mia (@Miabayuga) March 9, 2011
Today the whole world is the same age! There is only one chance every 1,000 years.
Your age + your year of birth, every person is = 2018
It is so strange that even Chinese and foreign experts cant explain it! You figure it out and see if it is 2018.
Worked for me, you??
— Rich Beem (@beemerpga) October 4, 2018
This year,the whole world is the same https://t.co/7NGoV2sZMl's a special day that happens every 1,000 years.Try bringing your age plus the year of birth to be equal to 2562 as well as everyone. It's amazing Even any national astrologers Can not explain & more will happen again
— RIKA 2019 😘😘 (@MrsArcharikaSri) May 23, 2019
Today the whole world is the same age!
Today is a very special day. Theres only one chance every 1,000 years.
Your age + your year of birth, every person is = 2018.
Its so strange that even Chinese and foreign experts cant explain it! You figure it out and see if its 2018.
— JB (@badnocs) September 18, 2018
Another element was that in every popular version’s comment sections: Some (but not all) commenters said that the numbers added up to the previous year, not the current one:
“Hmm I got 2018, did I math wrong?”
“Boo didn’t work for me. Gave me 2018”
A simple explanation exists for both the math itself, the above comments, and even the meme’s cyclical spread.
The year you were born added to your age will always add up to the current year — after your birthday that particular year. However, if your birthday is later in the year, the calculation will produce the previous year. As one blogger noted in 2017, that disparity completely disappears on December 31 of any given year:
It’s actually the case on 31 December every year. It also works for anybody on any day of the year after their birthday. I guess you could say that 31 December this year will be the only day EVER when everybody in the world will get 2019 if they add their age plus year of birth. (And next year, 31 December will be the only day EVER when everybody in the world will get 2020 if they add their age plus year of birth.)
As for the third matter — the claim’s repeated spread — that is because at its core, the meme is an ideal way to drive Facebook shares, Twitter retweets, and visits to a blog. In its 2019 form, the meme also featured additional elements to exacerbate its spread:
- This only happens every 1,000 years;
- No one can explain it;
- Experts/Chinese people/”foreign masters”/astrologists are stumped;
- …and no one knows why
A tacit sense of urgency or claims that something interesting is inexplicable drives interest and sharing or clicking. On its own, the claim looks interesting to people who haven’t thought it through. Coupling that initial lack of understanding with mystical sounding elements essentially ensures the meme’s enduring virality. Finally, everyone has a birthday, giving the claim a much wider appeal.
Although it’s technically true that adding your age (in the majority of people) and your birth year equalled 2019 in 2019, we’re rating this claim “not true” because it’s not a rare occurrence, it’s not a mystery, almost anyone can explain it, no experts are befuddled by it, and it’s true for any year. Your birth year plus your age (if your birthday has already occurred) will always equal the current year, for every single year in existence.