The treasury is thinking about raising the state pension age to 70 for people in their 20s.
Analysis for the Department for Work and Pensions (DWP) suggests that under 30s will have to work more as they live longer.
A separate report, by John Cridland, former boss of the Confederation of British Industry, says those under 45 may have to work to 68.
The government is due to make a decision on both reports by May.
Former Pensions minister Steve Webb spoke to James Brydges