The evolution of juvenile justice laws has been instrumental in addressing juvenile delinquency by shifting the focus from punitive measures to rehabilitative and restorative approaches. Historically, juveniles were treated as miniature adults, subject to severe penalties without consideration for their developmental differences. Over time, the recognition of juveniles' unique psychological and social needs led to significant reforms, emphasizing rehabilitation, reintegration, and prevention of recidivism. This paper explores the progression of juvenile justice systems across various jurisdictions, highlighting key legislative changes, such as raising the age of criminal responsibility, implementing educational and vocational programs, and integrating restorative justice practices. Empirical studies demonstrate that such reforms contribute to a substantial reduction in juvenile crime rates, foster accountability, and enhance opportunities for social reintegration. Despite these advancements, challenges such as resource constraints, societal stigma, and uneven implementation persist, particularly in developing countries. This study underscores the necessity of a holistic approach, combining legal reforms, community involvement, and socioeconomic support, to effectively reduce juvenile delinquency and build a more equitable justice system.