All others must work for 40 years.
Some 1.5 million workers and retirees are covered by the law, which President Nicolas Sarkozy says is outdated, unfair and costly.
Train drivers last night began open-ended strikes against the plan to revoke the 1945 law.
Slashing bureaucrats: The government plans to slash the number of state workers, mostly through early retirement and attrition.
Hospital and school workers plan to strike and protest on Nov 20.
Shutting courts: To cut costs, the government is consolidating districts and shutting dozens of courts.
Lawyers and judges will protest against this on Nov 29.
University finances:
Parliament passed a law in the summer to allow crumbling public universities greater autonomy, including the freedom to charge tuition fees.Groups of left-leaning students are blockading classes and joining worker protests, saying 'commercialising' universities goes against France's ideals of free public learning.
Other hot spots: Police will protest next Tuesday for greater pay and training; fishermen blockaded ports in Brittany last week over rising fuel prices; and Air France workers demanding better pay and conditions went on strike last month and are threatening more walkouts for the Christmas season.
ASSOCIATED PRESS