The Liberal Democrats have pledged to continue the triple lock protection for the state pension if they win the general election.
The party estimated pensioners would be £722 better off per year by 2021 by keeping the protection, which guarantees annual increases of the highest of 2.5%, average earnings, or inflation under the Consumer Price Index (CPI).
The Lib Dems, who introduced the policy under the coalition government, said this would be partly funded by removing access to the winter fuel allowance for wealthy pensioners.
The party calculated the state pension would come to £137.15 a week by 2021, compared to £122.30 this year. The party did not suggest an end-date for the policy.
Former business minister Sir Vince Cable said pensioner care was a bedrock of civilised society.
"Liberal Democrats believe that an important test of a civilised society is the way in which it cares for the elderly," he said. "We will protect the triple lock unlike the Conservatives.
"The guiding principle of the pensions system must be to ensure that none are left unable to meet their basic needs for survival and participation in society, and that everyone is treated with the respect and dignity they deserve."
Many have called for the triple lock to be scrapped and perhaps replaced with a double lock - based on average earnings or inflation - arguing the current arrangement is too costly and does not represent real economic growth.
The Lib Dems' promise follows a similar pledge by the Labour Party to retain the protection until at least 2025, while the Conservatives have not yet outlined their position.
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