No we don't it's a political/economic choice on the part of government.. In 1945 when they were introducing it, they didn't have a clause that said 'if life expectancy increases increase the pension age'. Blair wanted o increase the pension age for 2030ish but the Tories/Lib dems brought it forward. £6 grand less in not only my pocket but hundreds of thousand people.
Mind, there are those that bellyache about their shares that may get taxed. A 20% tax on share selling would be a good idea.
The doubling of spending on pensions since 2000 must be a myth then, we can just carry on as we are with pensions sucking up ever greater amounts of public spending at the expense of education, the NHS and so on. And for the record, when inflation is taken into account, it has gone from 6.6% of GDP in 2000 to 8% now.
As for the silly argument about firefighters, just 6% of firefighters are over 60 years of age, as there's a natural progression into desk jobs where their experience can be used as their physical capabilities decline. It's not exactly rocket science. You'll be complaining about footballers not being able to hack it until they're 66 next.