What is the right age to feed sweets and chocolates for kids?

I only let my children taste sweets and chocolates after they turn 2 years old as they have already developed teeth brushing habit. I think it is okay to let children to indulge in sweet stuff occasionally. So far, my children have no tooth decay due to the sweet intakes. However, you have to limit the intakes of the sweets as there will be a risk of developing obesity in children.