The Prohibition of Child Marriage Act (PCMA), 2006 is apparently aimed at prohibiting marriage of any girl below 18 years of age and any boy below 21 years of age.
This response to the comment "Protecting India's Protected Areas" by Praveen Bhargav and Shekar Dattatri (23 April 2011) points out the authors' misreading of the Forest Rights Act and also of the report of the Joint Committee on the FRA.