Yes, a 15-year-old is generally considered to be a child. The age of legal adulthood varies from country to country, but in most nations, individuals are considered minors (children) until they reach the age of 18. At 15 years old, a person is still in their adolescent years and has not yet reached the legal age of majority.
During this stage of life, individuals are still developing physically, emotionally, and mentally. They are likely to be attending school and living with their parents or guardians. In many legal systems, individuals under 18 are subject to special protections and are not treated the same way as adults under the law.
It's important to recognize that the definition of childhood and the age of legal adulthood can vary in different contexts and jurisdictions, so it's essential to consider the specific laws and cultural norms of a particular region. However, in general terms, a 15-year-old is still considered a child.