Through the sacranent of Confirmation, the baptized are more perfectly bound to the Church and are enriched with a special strength of the Holy Spirit. Hencethey are, as true witnesses of Christ, more strictly obliged to spread and defend the faith by word. 

Catechism of the Catholic Church Page 326

Confirmation, conferred by a Bishop, is received by children in the sixth grade usually in the Fall of the year. Adults who have never been confirmed may receive the sacament with the children or if they are enrolled in the RCIA Program they may receive at the Easter Vigil or at the Cathedral on Pentacost Sunday.