The Women Against State Pension Inequality group (WASPI) is asking for women's stories on state pension injustice after maladministration by the Department for Work and Pensions was found.
Women born in the 1950s would have lost out as a result of the changes and set up the group as a result.
It came as women suddenly discovered they had years to wait until they could get their state pensions as the old rule of women retiring at 60 and men 65 changed.