Also known as: adult activity · adult activity doctrine
Written by attorneys · grounded in primary & secondary sources — see below
A principle in tort law under which a minor is held to the standard of care of a reasonably prudent adult when engaging in activities typically performed by adults. The doctrine overrides the usual child-adjusted standard that accounts for age, intelligence, and experience. It applies when the conduct involves inherent dangers or responsibilities ordinarily assumed only by licensed or mature persons.
Austin Abbott, a seventeen-year-old apprentice at Alpine Mining's vehicle shop, received permission to conduct a solo test drive of a repaired sedan on the interstate. While attempting a high-speed lane change, he struck another motorist. In the resulting negligence suit, the court measured Austin's conduct against the adult reasonable-person standard because operating a vehicle on a public highway is an adult activity.
Alexis Archer, age fifteen and employed as a deckhand trainee at a commercial sightseeing company, was briefly allowed to steer the forty-foot tour vessel through a crowded harbor channel. She misjudged a turn and damaged a moored boat. The injured owner sued, and the court applied the adult standard because piloting a commercial vessel in busy waters constitutes an adult activity.
Select any source to read its text and confirm it supports the definition.
Alfred Ashford, a nine-year-old who had grown up on his family's livestock farm, was asked during a weekend tour to lead a docile goat near visiting guests. When the rope slackened, the goat knocked a tourist into a fence. The tourist sued, but the court applied the child standard because leading a goat on a family farm is not an adult activity.
The doctrine applies when a minor engages in conduct that adults routinely perform and that carries substantial risk to the public, such as driving on a highway or piloting a commercial vessel. Courts adopting the modern trend hold the minor to the ordinary reasonable-person standard to protect third parties and promote uniform safety rules. Activities like playing near a pool or handling a goat on a family farm remain subject to the age-adjusted standard.
Supporting sources
Licensure and training are relevant to show the minor has assumed adult responsibilities but do not automatically convert a recreational activity into an adult one. The key inquiry is whether the conduct is characteristically undertaken only by adults and involves significant public risk. Supervised trainee tasks in a commercial setting may still qualify if the core operation is an adult activity.
Supporting sources
When evaluating a child's contributory negligence, the same distinction applies. The child standard governs unless the child was engaged in an adult activity at the time of the injury. Courts therefore compare the child's conduct to a reasonable child of like age, intelligence, and experience rather than to an adult unless the adult-activity exception is triggered.
Supporting sources
…S. 105; Martin v. City of Struthers , 319 U. S. 141.[^maj-14] But the mere fact a state could not wholly prohibit this form of adult activity, whether characterized locally as a “sale” or otherwise, does not mean it cannot do so for children. Such a conclusion granted would mean that a state could impose no greater limitation…