At what age can a child start wearing contact lenses responsibly?

Varies by gender. In my experience girls mature more quickly than boys and typically can wear contacts responsibly at 10-12 years of age. Although some boys can do so, in my experience, most do better if you wait till 14-15! sorry guys!
Usually 11-14. This depends on the maturity level and ability to handle responsibility of the individual patient. Commonly, girls may be ready to start wearing contact lenses at age 11-13 and boys 12-14, rarely even earlier. It is very important to follow all the recommendations regarding insertion, removal, cleaning, and wearing time for the contacts as advised by the eye care professional.