There are always exceptions but 4 is not 7. My youngest was ready at around 8. My middle around 12 and my oldest in his teens. They were saved in that order. My Uncle is a minister (kind of raised me) and said that he believed one of his nephews would be called to minister and was going to leave his bible to him. He is still going strong and the boys still argue about "it's not going to be me, it's going to be you"
If it should ever happens it will probaby be the youngest after he settles down. (If he had been first he would have been the only :')
There are always exceptions but 4 is not 7I have heard of kids as young as 5 (I met a girl that remembers giving God her life in a preschool Sundays school class ). Many believe that John the Baptist was filled with the Holy Ghost in his mothers womb (not we never read of him being saved or Baptized in the NT ).
Our salvation is in Gods time (Kairos) .
I always thought my youngest would become a Pastor ..he is an engineer , but I have still not given up hope. In recent years I have met a lot of former engineers that became Pastors.. so we never know . That is in Gods hands and timing too..