Anne Robinson is stepping down as the host of Countdown after one year “in the hot seat”.
The former Weakest Link star, 77, joined the Channel 4 quiz show last year, becoming its sixth presenter and the first female to take the role.
Ms Robinson, who recorded 265 episodes of the show, said: “I’ve had a blast hosting this wonderful show. And I stayed longer than I signed up for. Now it is time for an older woman to take the reins.”
She added: “I hope too I’ve encouraged TV bosses to realise that not all women at the wrong end of their seventies are in care homes playing bingo and watching conjuring tricks.
“In fact the genius of Countdown is that it’s a brilliant way to keep the brain exercised. I run 5k most days of the week.
“And I can now do an anagram at twice the speed I could this time last year.
“But I have grandchildren, a large garden and a home in New York, all deserving more of my attention.”
She will appear in shows until the summer with a new host announced in due course, Channel 4 said.
‘Brilliant host on this iconic show’
A show spokesperson said: “Quick-witted Anne has been a brilliant host on this iconic show.”
Ms Robinson followed in the footsteps of Richard Whiteley, Des Lynam, Des O’Connor, Jeff Stelling and Nick Hewer as the presenter of Countdown, which launched in 1982.
She joined the daytime show last year alongside mathematician Rachel Riley and lexicographer Susie Dent, with her first instalment broadcasting on June 28.