Older women are barely visible on TV because of a "combination of ageism and sexism", it has been claimed.
New figures released by Labour deputy leader Harriet Harman, show how women disappear from TV screens as they get older.
As part of the work of the Older Women's Commission, Harman said that once women on television turn 50, their days on-screen are "numbered".
Harman, shadow secretary of state for culture, media and sport, wrote to the six main UK broadcasters asking them how many older women they employ on screen and behind the camera.
The findings were that while the majority of over 50s in the UK are women (53.1%), the overwhelming majority of TV presenters who are over 50 are men (82%).
While TV presenters are broadly reflective of age in the general population - 30% of TV presenters are over 50 compared with 34% of the UK population - they are unrepresentative in terms of gender.
It was discovered that only 7% of the total TV workforce (on and off-screen) are women over the age of 50.
Last week actress Julie Walters hit out at the lack of older female newsreaders, asking "where is Anna Ford?" in a reference to the 69-year-old former BBC anchor.
Harman said: "The figures provided by broadcasters show clearly that once female presenters hit 50, their days on-screen are numbered.
"There is a combination of ageism and sexism that hits women on TV that doesn't apply to men in the same way.
"It is an encouraging first step that broadcasters have been open in providing these statistics. Their response shows that they all recognise that this is an important issue that needs to be addressed.
"I will be publishing these figures annually so we are able to monitor progress."
Miriam O'Reilly, who won an employment tribunal against the BBC on the grounds of ageism, said: "These figures raise the obvious questions of where have all the older women gone and why did they go? Was it their choice to leave their jobs or was it a decision forced upon them?
"The broadcasters say they are committed to the fair representation of older women, but the figures don't bear that out. I'd like to know the reasons why so many talented women have disappeared, while their male counterparts have grown older and still have their jobs."
Harman will be holding a roundtable with broadcasters in the House of Commons today to challenge them to take action.
There will be representatives from the BBC, ITN, ITV, Channel 4, Channel 5 and Sky News.