Women born between 6 April 1950 and 5 April 1953 were affected by State Pension age equalisation under the Pensions Act 1995. The Pensions Act 2011 accelerated the equalisation of State Pension age, and included transitional arrangements limiting State Pension age delays, affecting women born between 6 April 1953 and 5 December 1953. It also brought forward the increase in State Pension age from 65 to 66 which affected women born between 6 Dec 1953 and 5 April 1960. Information on the numbers affected by parliamentary constituency is not held by the Department for Work and Pensions. However, a population breakdown of women by age at mid-2014 (women with birthdates in 1951 would have been aged 62 or 63 at this point) by constituency can be found in the Office for National Statistics’ data set of Parliamentary Constituency Mid-year Population Estimates for England and Wales: https://www.ons.gov.uk/peoplepopulationandcommunity/populationandmigration/populationestimates/datasets/parliamentaryconstituencymidyearpopulationestimates For Scotland: http://www.nrscotland.gov.uk/statistics-and-data/statistics/statistics-by-theme/population/population-estimates/special-area-population-estimates/spc-population-estimates