It's their phone, Their property. Their body, Their choice, Rather they understand it or not. A well-educated 6 year old is capable of making basic adult decisions. Most 6 year olds are not well-educated, Because our education system is incredibly flawed. Our culture defines kids as kids, And generally speaking they are considered as fragile goods. Too inexperienced to have the capacity and perspective to understand how to make decisions not based on hormonal pressures. But society can change, And we can in theory have and let 6 year olds make adult decisions.