Although the Western church suggests receiving the sacrament of confirmation after reaching the “age of reason” (around 7 years old, or second grade in the United States), it can be received at any time. All Christians who have been baptized are eligible to be confirmed. (A child in danger of death should receive confirmation as soon as possible, no matter his or her age.)
A confirmand must be in a state of grace before receiving the sacrament of confirmation. If the sacrament is not received immediately after baptism, the confirmand should participate in the sacrament of confession before confirmation.