An overwhelming majority of those questioned in an online survey expressed opposition to a proposal pushing back the retirement age.
The reform plan, which will be officially tabled September 18, avoids some of the more controversial proposals floated in recent weeks that included slapping a new tax on French retirees.
French businesses had campaigned against a rise in taxes or contributions, fearing the impact they would have have on competitiveness. The French economy is grappling with record unemployment, a high cost of labour and a huge tax burden.
Spain is pushing for state pension reforms that would link payments to life expectancy and to economic cycles, without raising the retirement age, employment minister Fatima Banez said.