By 2020, the SPA rises from 65 to 66.
Ms Altmann also called the Lifetime Isa a "Trojan Horse" that could "destroy pensions".
She said: "It is an Isa masquerading as a pension", and while she could see the benefits of encouraging saving, she was very concerned it could destroy pension savings in the UK.
A spokesman from the DWP said: "“State pension age rises have been widely communicated through media, including online, and extensively debated in Parliament.
"We also legislated for regular reviews into the State Pension age to make sure the system is fair, sustainable and affordable for the taxpayer. The first of these reviews will be published by May 2017”.
The DWP also ran a national advertising campaign about the 6 April 2016 changes to state pension in the lead-up to the increase. Its website contains a state pension age calculator for people unsure of when they are expected to reach SPA.