Most of us grew up in the age of Harry Potter, but the majority of the books were actually set back some time ago.

The first one is supposed to be set across the years 1991 and 1992, which is around five years before the book was even published.

So if you add it all up, it means that the Battle Of Hogwarts didn't actually take place until 1998 (how mind boggling).

Harry was born on July 31, 1980, making him the fair old age of 35 right now.

He had his first child with Ron's sister,Ginny, in 2004 when he was aged 24 meaning – after ALL the maths is done – Harry's son, James Sirius Potter, is now at the tender age of 11.

And since it's now September and schools are returning, that means James is setting off to London for his first journey on the Hogwarts Express!

How exciting!

Luckily for all us muggles, JK Rowling resorted to Twitter to let us in on the special event. 

After she tweeted the message, of course Twitter went into meltdown… 

We also couldn't help but look back at Harry's first trip to Hogwarts…

How cute!