Millie Bobby Brown and Stranger Things co-star Noah Schnapp were left in shock when they found out the real age of her character, Eleven.

Despite the show running for six years, it's never revealed as part of the storyline just how old the psychokinetic girl is.

"Eleven is 14?!" the pair could be heard exclaiming in sync finding out the news, as Bobby Brown added: "I was making out with Mike... at 13?"

"She's so young," Schnapp chimed in.

Fans were quick to point out that it's why Hopper is so protective.

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