No age requirement at all. But you do need instruction. I hope you already made your First Eucharist and Reconciliation as well. the first thing to do is contact your local parish to inquire when the classes begin and what information do they need from you. More than likely you will need to acquire a recent copy of your baptismal certificate for your registration of class.
The age of confirmation is settled by the bishop of the diocese. In some Latino countries, infants receive confirmation at their baptism. In other dioceses, it is done in the elementary school usually Jr.High grades. Still others confirm children at the high school age…and adults may be required to attend a full RCIA program or just adult confirmation preparation classes.
God’s blessings on you as you complete your sacraments of initiation. But as the sacrament says…this is not graduation from the church, rather full initiation into the church. And know you have even greater responsibility to spread the message of Christ to others by your actions and deeds.