At this age new connections are made between neuron-synapse routes in the brain. This allows children to think more abstractly. Parents recognize this as the time when children begin to question everything. Children now want to understand the reasons for why things are the way they are. Age thirteen is the time to formally start logic.
Logic is like math.
If you did math, you can do logic. Like the subject of math, I want to spread the subject of logic out over the school ages of thirteen through eighteen. Logic is best learned in a dialog format. As you learn in a group, you can help each other grasp logic concepts which are hard to understand. Discussions help facilitate better understanding of how logic connects with real life.