The working-age population fell between 2011 and 2016 as the number of pensioners increased.
Read moreRetirement
By Michael Buchanan
Social affairs correspondent, BBC News
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Video caption: The people trying to retire as early as possible Meet the extreme savers who live for an end to the nine-to-five.
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Video caption: Southampton shopkeeper 'legend' retires after 40 years Roy Kharbanda retired from his corner shop after spending 40 years in the heart of his community.
By Kevin Peachey
Personal finance reporter
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Video caption: 'The letter said I would have to wait five years for my pension' Krissy Abbott had to depend on food banks and handouts, when she was expecting to live on her state pension - but her retirement age had changed from 60 to 65.
By Katharina Stefanie
BBC News, Washington DC
By Ian Rose
BBC Business producer, Madrid