What defines an adult in the context of legal age?

The definition of an adult in the context of legal age is established in Wisconsin law as a person who is 18 years of age or older. This age is significant as it marks the point at which individuals gain full legal rights and responsibilities. For instance, reaching the age of 18 allows individuals to enter into contracts, vote in elections, and make independent legal decisions without parental consent.

The other options do not accurately define an adult under the law. While a person who is 17 years of age may be nearing adulthood, they are not yet legally considered an adult. Completing secondary education can reflect maturity and readiness for adulthood, but it does not change the legal age of adulthood. Serving in the military can grant certain rights and responsibilities earlier than age 18, but it does not redefine the legal age of adulthood. Thus, the correct definition, which establishes the transition to full adulthood and legal capacity, is the age of 18 or older.