In most Wizarding families, the children begin to exhibit their wizarding aptitude or witchery skills around age ten or twelve. Ginny Weasley manifested hers by snagging a Golden Snitch in flight as it zipped through the stands when she was six.

In retrospect, it seems obvious that she would be responsible for the Sight-Sharpening Charm now embedded in all magnifying equipment, but at the time, she was still enshrouded by the affair of Harry Potter and the Battle of Hogwarts.