Anong magandang edad payagan ang anak mo gumamit ng gadgets?

Personally, when I see that he's responsible enough to manage his time for play and studies. Ayoko kasi na mababad sya sa gadgets lalo na at an early age. I want to instill in him muna the discipline. So maybe around 10-12 years old, I can let him use gadgets but with close supervision.