Surely the best way to deal with this is to use one of the calculators to estimate how long one has to live for based on average rates of return of perhaps 5%, then compare that to one's own circumstances.
The average life expectancy currently is 84 for women and 82 for men. Look at one's family history of length of life, take a view on one's known health, then make a decision.
Government actuaries obviously advise on what investment pensioners to be must make in order to get X extra on their pension, one will never be sure that one will gain, but an individual has a far better idea than any Government official on whether this is a good bet or not.