By my calculations, the State Pension equates to less than half the minimum wage per annum - and anyone who is 65 is likely to have paid enough into the system to be entitled to the subsequent benefit regardless of whether they choose to continue working (and which is a necessity for some people if they want to avoid claiming benefits if the State Pension is their sole source of income).
A member of my family is still working at the age of 70 as the State Pension leaves very little to live on once his rent is paid.