EastEnders viewers were left pretty surprised this week, as many of them discovered 'Big Mo' Harris' age.
It wasn't just how old she was that got people talking though, but the fact she was a similar age to another character on the BBC soap.
It appears Mo is almost the same age as Walford legend Dot Cotton - and fans couldn't get over the news.
Some even believed they were identical in ages, only to realise there are apparently a few years in it.
It was recently said that Big Mo was 84 years old this month, which did come as a surprise to some viewers.
They then realised that Walford favourite Dot, played by actress June Brown, is apparently 87 years old.
As confusion set in, several fans took to Twitter unable to believe there was such a short age gap between the two.
One fan said: "Where were you when you found out Mo Slater is older than Dot Cotton?"
Another tweeted: "Okay but mo is as old as dot and I still can't get my head around it?"
There was some confusion though, with many commenting that they were the same age, or just months apart.
Perhaps the confusion comes from the cast members' real ages which are a little different to their characters.
Mo actress Laila Morse is actually a decade younger than her character, aged 74.
Meanwhile soap legend June, who plays Dot, recently celebrated her 93rd birthday.
This makes her around six years older than her alter-ego, and almost 20 years older than co-star Laila.
EastEnders airs Mondays and Fridays at 8pm, and Tuesdays and Thursdays at 7:30pm on BBC One.
