"It is lazy policymaking, which seems to allow politicians to feel they are absolved from other needed measures to protect pensioners."
Altmann warns that the triple lock does not properly protect oldest and poorest pensioners, but in fact leaves them relatively worse off, even though they need most protection. This is because older pensioners, who are on the old state pension will only have the basic State Pension protected - a maximum of around £120 a week, while newer pensioners have the full new State Pension of nearly £160 a week protected by the triple lock.
Additionally, the poorest pensioners on Pension Credit do not have the triple lock promise as Pension Credit only rises in line with earnings.
In contrast, under the new State Pension system, those pensioners who are in good health, have other income that pushes them into the 40% tax band or are still working, can choose to defer their State Pension and will get 5.8% extra for each year they delay. If they delay till they are 69 years old, they will get £200 a week.
Altmann continued: "If the new State Pension (which is designed to always be above the Pension Credit level) remains triple locked, while Pension Credit only increases with earnings, then the poorest and oldest pensioners will become relatively poorer. The longer the triple lock stays in place, the more the State Pension favours younger pensioners and relatively disadvantages poorest pensioners.
"The much-trumpeted 'triple lock' on State Pensions has been used by politicians to pretend that pensioners are brilliantly protected. In fact, it is lazy policymaking, which seems to allow politicians to feel they are absolved from other needed measures to protect pensioners. The longer it is maintained, the more unfairness it will create.
"Government must consider how to manage State Pension costs more fairly than just continually increasing the State Pension age, which unfairly penalises people with lower life expectancy and long working lives. Realising the inefficiency and unfairness of the triple lock, and the problems created by continually increasing state pension age, can help improve the operation of state pension policy in future."
"The Government should consider how to replace the triple lock promise from 2020 onwards, to prevent it from benefitting the younger and better off pensioners most. A double lock, increasing all parts of State Pension in line with the best of prices or earnings, would ensure pensioners keep up with the rest of society and the cost of living to prevent pensioners falling behind in future. And, of course, a double lock would still leave politicians free to increase more generously if they believe that is appropriate in any year."
