One in ten 70-74 year-olds in Britain are in employment, nearly double the number a decade ago and the highest figure since comparable records began in 1984.
Just over a quarter of a million people aged 70-74 are in employment, according to new figures from the Department for Work and Pensions (DWP).
That figure is up from 123,000 in 2005 and around 100,000 at the start of the century.
It is part of a broader trend that has seen a rise in the number of people of state pension age (65 and over) who remain in employment.
The numbers partly reflect demographic changes - people are living longer - but may also reflect the need for older people to continue earning later in life.
Paul Kenny, general secretary of the GMB union, said: "The trend for people to live longer has coincided with the cutting back by private sector employers of pensions for retired staff."
The figures from the DWP also show that around one in seven men of state pension age are currently in employment, up from one in 11 a decade ago.
A slightly lower number of women of pension age have jobs - roughly one in 14, up from one in 23 in 2005.