“Baptism, the Eucharist, and the sacrament of Confirmation together constitute the ‘sacraments of Christian initiation…’ [T]he reception of the sacrament of Confirmation is necessary for the completion of baptismal grace…[B]y the sacrament of Confirmation [the baptized] are more perfectly bound to the Church and are enriched with a special strength of the Holy Spirit. Hence they are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word and deed.” (Catechism of the Catholic Church, 1285)
Since 2004, it has been the policy of the Archdiocese of New Orleans to confer the sacrament of Confirmation on students in the 11th grade, after at least two years (30 hours) of preparation (http://www.archdiocese-no.org/scbparish/ORE%20Guidelines.pdf