Carol Vorderman and Richard Whiteley have signed a new deal to present Countdown for the next five years.
The pair will host the Channel 4 quiz show until at least 2009.
Countdown was the first show to be broadcast on the channel back in 1982 and is still going strong with an audience of 1.3 million viewers.
Vorderman, 43, said: “I love Countdown even more today than in 1982, so even more years with Twice Nightly Whiteley will be fantastic.
“I am the luckiest woman on the box. Twenty-one years is wonderful, but the problem is I can’t lie about my age any more and Richard can’t lie about his waistline.”
Whiteley – the first face ever to appear on Channel 4 – added: “Now I’ll just have to make sure that I have enough jackets, ties and awful puns to keep me going for the next five years.”
The show is to be honoured at a House of Commons reception tomorrow.
MPs will hail the show as a “national treasure” and praise it for promoting literacy and numeracy among all age groups.