Yesterday, Billie Eilish's "Bad Guy" dethroned Lil Nas X's "Old Town Road" as No. 1 on the Billboard Hot 100, which is major for many reasons — but it also led to this stunning fact: Hugh! McIntyre @PopBangHugh Wanna feel old? Billie Eilish is now the first musician born after 2000 to chart a No. 1 hit. 08:15 PM - 19 Aug 2019 Reply Retweet Favorite That's right, Billie Eilish, born on Dec. 18, 2001, is officially this first person born in the 2000s to achieve this milestone. The success! The talent! The fame! The youth! Frazer Harrison / Getty Images Yep, that's Billie in a Powerpuff Girls ensemble. The Powerpuff Girls premiered over THREE YEARS before Billie was born. She is also the youngest artist to do so since Lorde. Pop Crave @PopCrave .@BillieEilish (age 17) becomes the youngest artist to top the Hot 100 since @Lorde hit #1 with “Royals” in 2013 (at age 16). 08:39 PM - 19 Aug 2019 Reply Retweet Favorite Anyway, here are some more fun facts that'll make you feel positively ancient and positively in awe of what Billie's accomplished so far: 1. Since Billie was born in 2001, that means she was born after the millennium. Marc Burrows @20thcenturymarc Trying to get my head around the fact that Billie Eilish is a famous, credible pop star who was born AFTER THE MILLENIUM. I am so old. 07:30 PM - 30 Jun 2019 Reply Retweet Favorite It's also two full years after the Backstreet Boys released their album Millennium, but that's neither here nor there. 2. We're talking about the 21st CENTURY, people! •d🥝ra• @KarmicSlingshot oh god billie eilish was born in the 21st century 03:17 PM - 20 Aug 2019 Reply Retweet Favorite 3. Notably, this means Billie was born after 9/11. PAPANANAAMA @nastynapalm Knowing that Billie Eilish is 17 years old doesn’t make me feel old but realizing she wasn’t even born during 9/11 makes me feel ancient 07:39 AM - 20 Aug 2019 Reply Retweet Favorite 4. It's...a lot. Dara Fontein @deefontein You always hear older people talking about getting old but then holy moly all of a sudden you’re the one texting your best friend about how Billie Eilish wasn’t even born yet on 9/11 03:47 AM - 14 Jun 2019 Reply Retweet Favorite 5. This cat, found on 9/11, is older than Billie! N*I*C*K @catchdini On 9/11 my dad found a baby cat behind the garage and brought it home to cheer my sister up. When I see her now I say “you’re as old as the war on terror.” That cat is older than Billie Eilish. 03:52 AM - 01 May 2019 Reply Retweet Favorite 6. Destiny's Child hit No. 1 on the Billboard Hot 100 28 months before Billie was even born. Andy Tulin (of which the Moon is a part) @AndyTulin That doesn't make me feel old, it makes me feel like Billie Eilish is young. Wanna feel old? Destiny's Child hit No. 1 for the first time 28 months before Billie Eilish was born. THAT's how you make me feel old. https://t.co/Zy7rkiKmHB 09:24 PM - 19 Aug 2019 Reply Retweet Favorite 7. Speaking of music, Billie was born AFTER the first iPod was released. Getty Images That happened on Oct. 23, 2001. 8. Kidz Bop is also older than Billie — the first CD came out on Oct. 9, 2001... Concord Music 9. ...it featured covers of songs like "All Star," "Oops...I Did It Again," and "Blue (Da Ba Dee)". Republic Records 10. We've been in a world with Mike and Sulley from Monsters, Inc. longer than we've been in a world with Billie Eilish. Theo @theothertheo I’ve just realised that Billie Eilish wasn’t even born when Monster’s Inc came out. Fucking hell. 09:44 PM - 09 Apr 2019 Reply Retweet Favorite I can't even process that this means Boo from Monsters, Inc., would be 20 now! 11. Shrek came out a full 8 months before Billie was born... Dreamworks 12. ...and so did Spy Kids! Dimension Films 13. This Simpsons episode? Pre-Billie! Tulsi Golden Hurricane @thejohnhugar Billie Eilish was born two days after the Simpsons episode where Lisa becomes a Buddhist. 07:38 AM - 18 Jul 2019 Reply Retweet Favorite 14. Emma from Friends? Yeah, she's Billie's peer! Daniel @sillyolddaniel Billie Eilish, the popular singer, is six months older than Emma, the fictional baby from Friends. 11:34 AM - 19 Aug 2019 Reply Retweet Favorite 15. In other TV news, Lizzie McGuire premiered on Disney Channel almost a full year before Billie was born... Disney ^My face reacting to that news. 16. ...and Billie's favorite show, The Office, premiered when she was 3. NBC 17. Jacob Sartorius is merely a YEAR younger than Billie... five of nine @scorpinelle how is jacob sartorius only one year younger than billie eilish ? ? shit don't add up 01:08 PM - 12 Aug 2019 Reply Retweet Favorite 18. ...and, finally, so is JoJo Siwa. Syd @sydney_eisele My roommate reminded me that Jojo Siwa is only one year younger than Billie Eilish and I haven’t been the same ever since 03:39 PM - 09 Sep 2018 Reply Retweet Favorite PSA: This reaction GIF from Titanic that I needed to use to finish this post happened four years before Billie was born. 🙃 Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Tap to play or pause GIF Paramount Pictures Anyway, congrats again, Billie! Can't wait to see what you do in the NEXT 17 years!