Factories Act, 1948
104. Onus as to age
(1) When any act or omission would, if a person were under a certain age, be an offence punishable under this Act, and such person is in the opinion of the Court prima facie under such age, the burden shall be on the accused to prove that such person is not under such age.
(2) A declaration in writing by a certifying surgeon relating to a worker that he has personally examined him and believes him to be under the age stated in such declaration shall, for the purposes of this Act and the rules made thereunder , be admissible as evidence of the age of that worker.