If someone is 19 years old, they are legally considered an adult in most countries, including the United States. Therefore, any form of physical violence or abuse towards a 19-year-old would not be classified as child abuse but rather as assault or battery, depending on the jurisdiction.
Child abuse typically refers to the mistreatment of individuals who are underage and still legally considered children or minors. Once a person reaches the age of majority (usually 18 years old), they are considered adults and are no longer covered by child protection laws.
However, it's essential to understand that any form of physical violence or abuse is unacceptable, regardless of the age of the victim. If someone experiences violence or abuse, they should seek help and support from appropriate authorities or organizations that deal with such matters, such as law enforcement, social services, or helpline resources. Remember, there are resources available to help individuals facing abusive situations, regardless of their age.