No, RCIA is also for children that are over the age of 7, this is referred to as the Children's Catechumenate.

What is the Children’s Catechumenate?
The Children’s Catechumenate is the process by which children and youth are prepared to celebrate the Sacraments of Initiation into the Catholic Church.  Taking into consideration the children’s ages and levels of maturity, they will receive a basic understanding of Christ and what it means to know and love God. We will provide a space that enables children and youth to enter into a relationship with God and share in the life of their identity as Children of God. The importance of weekly Mass will be stressed and along with the ongoing guidance of what it means to live a Catholic life provided primarily by the witenss of the parents and sponsor.
 
Who is it for?

• Children and youth between the ages of 7 and 18 that are unbaptized
• Children and youth baptized in another Christian tradition and seeking to join the Catholic Church