Argentina's Supreme Court judges are backing a 97-year-old fellow justice amid government claims he is physically and mentally incapable of remaining in his post.

Carlos Fayt is the oldest member of the court. The government has been questioning his absence at recent hearings, including one in April to confirm the panel's president, Ricardo Lorenzetti.

Fayt later signed the decision selecting Lorenzetti, and the judges said Wednesday the signature was enough for that kind of action.

President Cristina Fernandez's government recently called for a congressional investigation of Fayt's ability to serve at his advanced age.

Opposition members accuse the Fernandez administration of trying to replace Fayt with a judge more sympathetic to the government during an investigation of the president's finances and the trial of several officials on corruption charges.