Jedward: Their DNA is the same - but do the world's most famous twins share a biological age?

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…