All women born between 6 April 1953 and 5 April 1960 will see an increase in their State Pension age as a result of the Pensions Act 2011. Estimates of the number of such women at local authority and constituency level can be made from the relevant population estimates, published by the Office for National Statistics. a) Local Authority population estimates, relating to mid-2014 can be found in âMYE2_population_by_sex_and_age_for_local_authorities_UK.xlsâ which can be found within the zip file ârft---mid-2014-uk-population-estimates.zipâ obtainable by selecting âPopulation Estimates for UK, England and Wales, Scotland and Northern Ireland, Mid-2014â at http://www.ons.gov.uk/ons/taxonomy/search/index.html?pageSize=50&sortBy=none&sortDirection=none&newquery=Population+Estimates+for+UK%2C+England+and+Wales%2C+Scotland+and+Northern+Ireland%2C+Mid-2014&content-type=Reference+table&content-type=Dataset&nscl=Population+Estimates b) Parliamentary Constituency (England and Wales) level population estimates, relating to mid-2013 (the latest available) can be found by selecting âSAPE15DT7 - Parliamentary Constituency Mid-Year Population Estimates (experimental), Mid-2013â at http://www.ons.gov.uk/ons/publications/re-reference-tables.html?edition=tcm%3A77-367629 (and for Scotland, mid-2013, at: http://www.nrscotland.gov.uk/files//statistics/population-estimates/special-area/UKPC/ukpc-pop-est-2002-2013.xls)