Earlier in the day, the Court had adjourned the plea till January 24 but recalled the matter after Nirbhaya's parents objected.
Gupta, in his plea, had stated that since he was juvenile in 2012 when the rape was committed and that he should be treated under the Juvenile Justice Act. He alleged that his ossification test was not done at that point of time and he should be given the benefit of that, news agency ANI reported.
The convict argued that the claim of juvenility can be raised at any time even after the final disposal of the case.
Gupta is one of the accused of the rape of a 23-year-old paramedical student in December. 2012.
Six men were involved in the heinous crime which took place in a moving bus.