A leading charity has warned that around 70,000 people in their fifties and sixties will miss out entirely on the new state pension between now and 2030.
An Age UK study found that 50,000 women and 20,000 men do not have the minimum number of qualifying years of National Insurance contributions (NICs).
Changes to the system coming into effect on 6 April mean that people will need 10 qualifying years to get any new state pension. This is a change from the existing regime which allows people to receive at least some state pension even with only a few years of NICs.
UK news in pictures
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1/19 24 June 2017
Britain's opposition Labour Party leader Jeremy Corbyn addresses revellers from the Pyramid Stage at Worthy Farm in Somerset during the Glastonbury Festival
2/19 23 June 2017
British Prime Minister Theresa May addresses a news conference at the EU summit in Brussels, Belgium, June 23, 2017
3/19 22 June 2017
Cosplay fans (L-R) George Massingham, Abbey Forbes and Karolina Goralik travel by tube dressed in Harry Potter themed costumes, after a visit to one the literary franchise's movie filming locations at Leadenhall Market in London, Britain
4/19 22 June 2017
Racegoers cheer on their horse on Ladies Day at the Royal Ascot horse racing meet, in Ascot, west of London
5/19 21 June 2017
A reveller walks among the tipi tents at the Glastonbury Festival of Music and Performing Arts on Worthy Farm near the village of Pilton in Somerset, South West England
6/19 20 June 2017
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The Borough Market bell is seen in Borough Market in central London following its re-opening after the June 3 terror attack
Two women embrace in Borough Market, which officially re-opens today following the recent attack, in central London
Mayor of London Sadiq Khan attends the re-opening of Borough market in central London following the June 3 terror attack
People walk through Borough Market in central London following its re-opening after the June 3 terror attack
News Corp CEO Rupert Murdoch, with one of his daughters, visit Borough Market, which officially re-opened today following the recent attack
A woman reacts in front of a wall of messages in Borough Market, which officially re-opened today following the recent attack, in central London
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Millwall fan and London Bridge hero Roy Larner on 'Good Morning Britain'
Richard Arnold, Roy Larner, Piers Morgan and Susanna Reid on 'Good Morning Britain'
16/19 11 June 2017
England players celebrate after defeating Venezuela 1-0 to win the final of the FIFA U-20 World Cup Korea 2017 at Suwon World Cup Stadium in Suwon, South Korea
17/19 11 June 2017
England players celebrate with the trophy after the final match of the FIFA U-20 World Cup 2017 between Venezuela and England at Suwon World Cup Stadium in Suwon, South Korea
18/19 11 June 2017
Great Britain's Alistair Brownlee celebrates winning the Elite Men Columbia Threadneedle World Triathlon Leeds
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19/19 11 June 2017
Two men drink beer outside the Southwark Tavern which reopened for business today next to an entrance to Borough Market which remains closed in London
The full new state pension will be £155.65 per week, and the change applies to women born on or after 6 April, 1953 and men born on or after 6 April, 1951.
Age UK said it supports the aim of a simpler, fairer state pension, acknowledging it should benefit many people with low lifetime earnings due to low pay and caring responsibilities.
But the charity is concerned that there are many approaching retirement, particularly women, who do not have a full NI record.
Age UK's charity director Caroline Abrahams said: "Big changes are about to come in to simplify the state pension system, yet we know that many people in their fifties and sixties are completely unaware of how they will be affected."
"There is evidence suggesting that some people in this age group are so worried about what their finances will be once they retire that they are reluctant to think about it at all, but our strong advice is to take action now to find out exactly where you stand."
"The reality is that the news will be good for some but disappointing for others, which is why it is so important for everyone approaching retirement to check their state pension age and what they'll receive when they reach it."
A Department for Work and Pensions spokeswoman said: "The new state pension will bring much needed certainty for savers and provide a solid foundation upon which people can build up their retirement savings.
"People who haven't built up enough National Insurance can apply for Pension Credit, which works by topping up their other income and provides additional security in retirement.”
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