No such estimate has been made of the effect of changes to the state pension age for women born in the 1950s on revenue accruing to the Exchequer.
The Government decided over 25 years ago that it was going to make the State Pension age the same for men and women.
Raising State Pension age in line with life expectancy changes has been the policy of successive administrations over many years
DWP estimate that the total additional cost if we had not implemented any increases in State Pension age would be in the region of £215bn for the period 2010/11 to 2025/26, in 2018/19 prices. This figure takes into account State Pension, other pensioner benefits, and savings made on .working age benefits.