So, you're wondering how old the kids from Stranger Things are now, huh? Well, grab a slice of Eggo waffle and let's dive in, 'cause things have changed since we last saw our faves in the Upside Down.

Millie Bobby Brown - Eleven

Our favorite telekinetic badass, Millie Bobby Brown, was just 12 when she first graced our screens as Eleven. Now, she's a cool 18 years old! Can you believe it? She's grown up right before our eyes, and not just in age. She's become a UNICEF Goodwill Ambassador, started her own production company, and even has her own Netflix series, Enola Holmes, under her belt.

And let's talk about her style evolution. From Eleven's iconic blonde buzz cut to her red carpet glam, Millie's come a long way. She's even been named one of Time's 100 most influential people in the world. Not bad for an 18-year-old, right?

Finn Wolfhard - Mike Wheeler

Finn Wolfhard, who plays our lovable nerd, Mike Wheeler, was just 13 when Stranger Things first aired. Now, he's a strapping young lad of 19! He's grown into quite the heartthrob, with his signature curly hair and charming smile.

Finn's also become quite the busy bee. He's acted in several movies, including The Goldfinch and It, and even started his own band, Calpurnia. He's also been open about his struggles with anxiety, using his platform to raise awareness about mental health. What a guy!

Noah Schnapp - Will Byers

Little Will Byers, played by Noah Schnapp, was just 12 when he went missing in Hawkins. Now, he's a 17-year-old with a voice that's broken like a heart on Valentine's Day. (Sorry, Noah, we still love you!)

Noah's voice might have changed, but his talent hasn't. He's continued to act in movies like The Peanut Butter Falcon and even lent his voice to the animated series, Big Mouth. And let's not forget his iconic performance as the voice of Charlie Brown in the Peanuts movies.

How Old Are the 'Stranger Things' Kids in Season 4?How Old Are the 'Stranger Things' Kids in Season 4?

Gaten Matarazzo - Dustin Henderson

Our favorite "yes, yes, yes!" guy, Gaten Matarazzo, was just 13 when he first appeared as Dustin Henderson. Now, he's a 19-year-old with a smile that could light up the darkest corners of the Upside Down.

Gaten's also become quite the advocate for people with cleidocranial dysplasia, a condition he was born with that affects the growth of bones and teeth. He's even started his own foundation, The pits, to raise awareness and support research for the condition.

Caleb McLaughlin - Lucas Sinclair

Caleb McLaughlin, who plays Lucas Sinclair, was just 14 when he first joined the Stranger Things gang. Now, he's a 20-year-old with a whole lot of talent and a whole lot of style. (Seriously, have you seen his red carpet looks?

Caleb's also become quite the dancer, even performing on So You Think You Can Dance. He's also acted in several movies, including Conjuring spin-off, The Nun, and even had a recurring role on Law & Order: Special Victims Unit.

The Kids of 'Stranger Things': Then and NowThe Kids of 'Stranger Things': Then and Now

Sadie Sink - Max Mayfield

Sadie Sink, who joined the cast as Max Mayfield in season 2, was just 15 when she first appeared on our screens. Now, she's a 20-year-old with a whole lot of talent and a whole lot of fans.

Sadie's also become quite the style icon, with her fashion choices often making headlines. She's also acted in several movies, including The Whale with Brendan Fraser, and even had a recurring role on The Americans.

And there you have it, folks! The kids from Stranger Things have grown up right before our eyes. It's crazy to think that these talented young adults were once just a bunch of kids riding bikes and fighting monsters in Hawkins.

But hey, that's showbiz, right? One minute you're a kid fighting off the Mind Flayer, the next you're a grown-up fighting off paparazzi. (Well, maybe not quite yet, but you get the idea.)

So, here's to the cast of Stranger Things - may their futures be as bright as Joyce's Christmas lights, and may they continue to inspire us all with their talent, kindness, and courage. Now, who's ready for season 5?