There is strong opposition in French Polynesia to the government's pension reform which would raise the retirement age from 60 to 62.
The consultative body, the Economic and Social Council, almost unanimously rejected the reform plan at its meeting in Papeete.
The plan also requires those seeking to have a full pension to contribute to social security for 38 years and not for 35 as now.
The adjustments are being proposed because of the poor financial state of the pension fund, with proponents saying change is urgently needed to save it.
Union leaders are expected to meet the president Edouard Fritch this week to discuss their concern.
The reform plan is likely to be discussed in the territorial assembly next month, with decisions hoped to be finalised before the election in April.
