John and Edward Grimes burst on to the scene in 2009 as a phenomenon on X-Factor, and have been a mainstay on the showbiz scene ever since.

TV, movies, Eurovision: no one can escape this Irish duo's j-epic brand of entertainment.

But what impact has more than 15 years of fame had on the boys as they became men?

Their care-free, feel-good attitude is synonymous with the Jedward brand, but losing their mum at an early age, and playing the fame-game has had its own impact behind the scenes.

Now 33, they've given Katherine Ryan a few drops of their blood to get it tested, so she can find out their biological age.

As twins, their DNA is an exact match, so our resident scientist Dr Nichola Conlon explains how slight variations in diet and mindset could be a reason why their biological ages might differ...  

And will the boys get competitive when the results are incoming? You bet!

 Lead producer– Mick Coyle

Social media -   Cassidy Rebelo

Video Producer – Elena Cotton

Video Producer– David May

Artwork – Ben Watkins 

Video Editor -  Paul Collins-Reddin 

Head of Video – Edie Jefferys

Sound Designer – Dominic Delargy

Executive Producer – Henrietta Harrison

Chief CreatIve Officer – Lucie Cave