In the first of five televised debates ahead of next February's elections, candidates faced questions on law, governance, human rights and rising corruption in the world's third-largest democracy.

They sparred over a recent court ruling that changed the age requirements for candidates, effectively paving the way for President Joko Widodo's 36-year-old son to be named as the vice-presidential candidate of defence minister, Prabowo Subianto, the frontrunner.

"Many regulations have been bent according to the interests of those in power," said presidential candidate and former Jakarta governor Anies Baswedan, in his opening statement.

"There is one millennial who could be vice president, but there are thousands of other millennials, Gen Z, who care about the nation that are marginalised," he said. "When they criticise the government instead they face violence, even tear gas."

The former governor said trust in the country's democracy had dropped, with diminishing room for free speech and political opposition.

The October court ruling sparked fears about a democratic backslide and a return to the nepotism and patronage politics that characterised the decades-long rule of former president Suharto, who was forced from power in 1998.

In a statement, Prabowo appeared to allude to possible judicial interference, telling his fellow candidate former central Java governor Ganjar Pranowo; "We are no longer children, the public is smart, the public knows, Ganjar. We know the process, who did the intervention, but the point is we need to enforce the constitution."

Prabowo, a former special forces commander and ex-son-in-law of Suharto, has secured a commanding lead, with several recent surveys showing he is 20 points ahead of his two opponents.

VOTERS TO JUDGE

Describing voters as the highest judge, Prabowo said it was ultimately up to the public to decide.

"If we are at fault, if we have betrayed people, then it is the people who will punish us," he said.

Prabowo was also questioned about his alleged involvement in the kidnapping of 13 student activists in 1998, claims that he always denied.

"The fact is those people who were once arrested, the political prisoners, those which many people said had been kidnapped by me, now they are on my side," he said.

Ganjar, who has focused his campaign at the grassroots, said public services needed to be prioritised, and called for state losses from corruption to be used for the public good.

"Based on data from Indonesia Corruption Watch, state losses over the past 10 years have reached around 230 trillion rupiah ($14.73 billion). This number equals what we need to build 27,000 community health centers," he said.

($1 = 15,615.0000 rupiah)

(Editing by Kanupriya Kapoor; Editing by Sharon Singleton)

By Kate Lamb and Ananda Teresia