"I feel young, I am in great shape and I want this to be legally recognised because I feel abused, aggrieved and discriminated against because of my age."

The single father, who said he has tried in vain to stop his basic pension, told the tribunal on Monday that his petition was "legitimate", likening his bid for a legal remedy to people who register a change of official gender.

"Today we can choose our work, gender, political and sexual orientation. We even have the right to change our name. So why do we not have the right to change our age?" he said.

According to his doctor, his biological age is between 40 and 45, he said.

Ratelband said while he was initially greeted by "jeers" from magistrates, he now believes his lawyer -- famous criminal lawyer Jan-Hein Kuijpers had "unsettled" the judge.

"This case is unprecedented, there is no jurisprudence. The chances of success are minimal but we believe that the legislation must evolve with the times," Kuijpers said.

The court must decide within four weeks.

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