What is the correct age for qatna to baby boy either 2 years or 4 years or 5 years

A. You should do it at an early age by the timer one year or prior to that that’s the best time to go for it otherwise do you are just going to be better because the moment for the child is not going to be that much but by the age of 4as a child goes to school and also it is going to be a little difficult that time