We're a little over a week now until the big day and it's clear many of us have already started our Christmas movie marathons to bring on the festivities the right way.

And the beloved Home Alone franchise is high up there on the list alongside the other feel-good family favourites, like Elf and How the Grinch Stole Christmas.

The festive flick came out three decades ago now in the 90s, starring a baby-faced Macaulay Culkin, Joe Pesci, Daniel Stern, John Heard and Catherine O'Hara.

The first film's plot centres around eight-year-old Kevin McCallister (Culkin) who is accidentally left behind when his family leaves for France.

At first, he's happy to be in charge; but when thieves Marv (Stern) and Harry (Pesci) try to break into his home, he puts up a fight like no other.

And while the majority of us will be able to recite entire monologues off by heart - it's clear not many of us are in the know about a certain cast member's age as Home Alone viewers are only just realising how old Marv is actually supposed to be.

Now, the film came out in 1990 - meaning that Stern, who was born in 1957, would have been 33 years old at the time of filming.

According to a social media post, this means that anyone born in 1991 or before will now be the age Stern was at the time - something which has clearly shocked 90s kids all over.