A Scottish Government paper this week will make it clear that the Scottish Parliament would determine the state pension age.
With life expectancy in Scotland lower than the UK as a whole, Deputy First Minister Nicola Sturgeon said: "We want to make sure the pension age suits Scottish circumstances."
Better Together said it would publish a list of promises made by the SNP over the course of the campaign. It said some were "so vague or so lacking in detail that it is impossible to assign a cost", but the total is now at least £32 billion.
Head of Better Together, Alistair Darling, said: "The nationalists continue to make extraordinary promises without telling us how they would pay for them. Alex Salmond is either making false promises he cannot pay for or he is planning big tax rises."
It comes as Ms Sturgeon and Finance Secretary John Swinney prepare to launch the Scottish Government's pensions proposals.
The paper will spell out the arrangements for state, private and public sector pensions. It is also expected to confirm the Scottish Government's approach to protecting the basic pension and less well-off pensioners.
The age people can start to receive it in the UK is due to rise to 66 for both men and women from 2018 and to 67 from 2026. Life expectancy in Scotland for males born this year is 2.5 years lower than the UK average and 1.8 years lower for females, the Government said.
The document will say: "The UK Government's plans are based around the core principle that the proportion of adult life spent in receipt of the state pension should be consistent to ensure fairness between generations.
"These changes fail to recognise life expectancy can be more restricted for particular socio-economic groups. The proportion of adult life spent in retirement, and in receipt of a state pension, reduces to a greater extent for those in lower socio-economic groups who have on average a lower life expectancy."
A spokeswoman for the Department for Work and Pensions said: "Spending on pensions, on benefits and on public services is all more affordable as part of the UK.
"Pensions spending per head is already higher in Scotland than in the rest of the UK, and in future Scotland will have a higher proportion of elderly people."