f501dbc2_rical_and_Theological_Analysis__2
[0] I. [2] 
The age of discretion for both Confession and Communion is the time when a child begins to exercise his reason. This is normally around the seventh year, more or less. From this time also begins the duty of keeping the precept of Confession and Communion.
Fr. Hardon Archives - First Confession: An Historical and Theological Analysis
2