She's been Agatha all along, but Teen definitely hasn't been Billy all along. In "Agatha All Along" Episode 6, we learned exactly how long Wanda's son has been around in Eastview — and the answer is,

Agatha All Along finally provided more information on Joe Locke's mysterious Teen in Episode 6, answering long-held questions and confirming a few fan theories. Locke's character's identity had been a mystery up until the end of Episode 5 of the Disney+ series, thanks to a magical sigil that stopped the witches from learning his true name.

Agatha All Along has kept the reveals rolling over the past few episodes, with the biggest undoubtedly being Teen ’s real identity. Joe Locke’s mysterious Marvel character is actually Wiccan, AKA Billy Maximoff, after all, and episode six revealed exactly how that’s possible.

Agatha All Along Episode 6 took us off the Witches Road and down memory lane to fill us in on Billy Maximoff’s (or should we say Billy Kaplan’s) tragic backstory, but that wasn’t the only dark reveal.

Warning! The following features major spoilers for Agatha All Along episode 6 so turn back now if you are yet to see it. Given that it was following on from last week's reveal that Teen is indeed Billy Maximoff,