THE number of people working beyond state pension age has almost doubled to 1.4 million in the past 20 years, figures show.

The Office for National Statistics (ONS) said the numbers were relatively stable until 2000 but then increased to a peak of 1.45 mil- lion in 2010.

One-third of older workers were self-employed, compared with 13% of those below the state pension age, while older employees were twice as likely to work part-time in full-time posts.

The ONS said those remaining in the labour market over pension age worked fewer hours, possibly helped by the support of their state pension and other pension arrangements, allowing them to fit their work around other engagements.

Dr Ros Altmann, director-general of Saga, said: "Many older people are choosing to stay at work, often part-time so that they ease more gently into retirement. If they feel fit and healthy and want more money, and are able to work, they are choosing to do so.

"Saga's research shows that many of our over-50s already want to work past 65. Around 71% would like to work part-time rather than retiring and in fact 7% are already working past the age of 70.

"This isn't just for the money – work satisfaction, feeling useful and the social benefits we gain from working were key reasons that people wanted to continue."

Darren Philp, policy director of the National Association of Pension Funds, added: "Our rapidly changing demographic is hitting home. Having more older people in the workforce will become the norm. Many are choosing to ease into their retirement for social and financial reasons, and part-time work is a popular option. Employers also value the skills and experience of older staff.

"The problem comes as people want to retire but end up stuck at work as they cannot afford to leave. With half the workforce not saving into a pension, this is going to become a painful reality for millions."