Millie Bobby Brown "Stranger Things" season one
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The Cast Of 'Stranger Things' Is All Grown Up

If you can believe it, it has already been six years since Stranger Things premiered, taking Netflix by storm, and now the cast is all grown up.

In the spirit of celebrating the show's season four premiere on May 27, here's a closer look at the cast of Stranger Things in season one versus now.

It looks like the cast of "Stranger Things" is all grown up.

The cast of Stranger Things at the season one premiere.
Getty Images | Jason LaVeris

While it might feel like hardly any time has passed since the show's debut, it has been a whole six years. The cast, who started off as children, have sprouted into young adults.

Here's what Gaten Matarazzo, who plays Dustin Henderson, looked like when "Stranger Things" debuted in 2016.

Gaten Matarazzo "Stranger Things" season one
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Born on September 8, 2002, Gaten Matarazzo was 13-years-old when the show was released. But it's safe to say that he has come a long way.

Here is what Matazzaro looked like ahead of the season four premiere on May 15, at 19-years-old:

As you can see, he has had quite a growth spurt.

Here's Caleb McLaughlin back in 2016.

Caleb McLaughlin "Stranger Things" season one
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Born October 13, 2001, Caleb, who plays the role of Lucas Sinclair, was 14-years-old when Stranger Things' first season was released. Since then, he has completely transformed his look.

Here is what McLaughlin looks like now, at 20 years old:

Caleb McLaughlin
instagram | @therealcalebmclaughlin

Nowadays, McLaughlin is focused on his music career.

“I wouldn’t be here without Stranger Things, but now I’m able to showcase that I’m a singer and dancer as well," he said ahead of the season four premiere.

Here's Noah Schnapp, who plays the role of Will Byers, in 2016:

Noah Schnapp "Stranger Things" season one
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Born on October 3, 2004, Noah Schnapp was just 11-years-old at the time that Stranger Things was filmed.

And here's Noah now:

Noah Schnapp at "Stranger Things" season four premiere
instagram | @noahschnapp

Noah, now 17, has had a massive transformation since the show began, and so has his fashion taste! We're here for it.

Here's Finn Wolfhard, who plays Mike Wheeler, in 2016:

Finn Wolfhard "Stranger Things" season one
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Born on December 23, 2002, Finn was 13 when he filmed the first season of Stranger Things.

Here's what Finn looks like now, at 19-years-old:

Finn Wolfhard at the Stranger Things season 4 premiere.
Getty Images | Theo Wargo

Like his co-star Caleb McLaughlin, Wolfhard has geared his focus toward his music career. The actor moonlights as a vocalist and guitarist for the indie rock band, The Aubreys.

Last, but certainly not least, here's Millie Bobby Brown, who plays Eleven, in 2016, when she was 13 years old.

Millie Bobby Brown "Stranger Things" season one
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Millie, born February 19, 2004, has arguably had the most significant transformation out of the entire Stranger Things cast.

Here's what Millie looks like now, at 18-years-old:

Millie Bobby Brown in a white gown at the Stranger Things season 4 premiere.
Getty Images | Roy Rochlin

So there you have it! The cast of Stranger Things is all grown up. Let us know what you think in the comments below.