At what age can a child be considered old enough to be sued for negligence? Four is old enough in NY

The Wall Street Journal law blog is reporting today that a trial court judge in Manhattan has held that a 4-year-old girl is old enough to be sued in a personal injury action. The girl allegedly ran into an elderly woman as she raced her bicycle with another child on the sidewalk in front of her house. She was riding her bicycle with her training wheels under the supervision of her mother. Go here for the story in the WSJ, here for the story in the New York Law Journal; here for the NYT article. UPDATE: two more comments on this case here and here.