Alright, gather 'round, 'cause we're about to dive into the Upside Down of Stranger Things' character ages. Grab your Eggo waffles and let's get started!

Eleven: The Enigmatic Teen

Now, Eleven, our favorite telekinetic badass, is a bit of a mystery. She was raised in Hawkins Lab, so she didn't exactly have a birth certificate cake smash. But according to the Duffer Brothers, she's around 12 or 13. Yikes, right? All that power and she's still a tween!

Fun fact: Millie Bobby Brown, who plays Eleven, was only 12 when she auditioned. Talk about typecasting!

Mike, Lucas, Dustin, and Will: The Original Gang

Our core group of friends are all 12 years old when the series starts. That's right, they're all in sixth grade. So, when you see them riding bikes and causing mischief, just remember, they're probably skipping homework to do it.

But here's where it gets weird. In season two, Will's been missing for almost a year, and he's still 12. Time dilation in the Upside Down, maybe? Or just a plot hole? You decide!

Nancy and Jonathan: The Older, Wiser... Okay, Not Really

Nancy and Jonathan are both 16 when the series starts. They're supposed to be the "adults" of the group, but let's be real, they make some pretty teenage mistakes. Nancy's whole "bad girl" phase? Yeah, not very mature.

How old are the Stranger Things cast and characters in real life? - CapitalHow old are the Stranger Things cast and characters in real life? - Capital

And Jonathan? Well, he's supposed to be this brooding, mature photographer, but he's still sneaking out to investigate monsters. Typical teenager.

Joyce and Hopper: The Adults (Sort Of)

Joyce and Hopper are both in their 30s, so they're supposed to be the responsible ones. But Joyce believes in the supernatural before anyone else, and Hopper's more of a grumpy teenager than a grown-up. So, who's really in charge here?

Fun fact: Winona Ryder (Joyce) is actually older than David Harbour (Hopper) in real life. But don't tell Hopper that. He's sensitive about his age.

How Old Was the Cast When Stranger Things Started? Real Ages in 2016How Old Was the Cast When Stranger Things Started? Real Ages in 2016

Max and Billy: The New Kids on the Block

Max, the cool older sister, is 13 when she moves to Hawkins. She's supposed to be this rebellious teen, but she's actually pretty mature for her age. Go figure.

Billy, on the other hand, is 17 and a total jock. He's supposed to be the big, bad bully, but he's actually pretty clueless. Poor guy can't catch a break, even when he's trying to be menacing.

So, How Old Are They Really?

Well, that's the million-dollar question, isn't it? The Duffer Brothers have been known to play fast and loose with the timeline, so who knows how old these characters really are? But one thing's for sure: they're all stuck in Hawkins, fighting monsters, and growing up way too fast.

And that, my friends, is the age-old mystery of Stranger Things' character ages. Now, who's ready for another round of waffles?