Movement coordination development represents a complex interaction between neuromuscular control systems, biomechanical constraints, and environmental interactions. From a biomechanical standpoint, coordination is not merely the execution of motor commands but an emergent property arising from intersegmental dynamics, motor synergies, and adaptive control strategies. The present study provides an in-depth theoretical and analytical examination of movement coordination development across lifespan stages, integrating kinematic, kinetic, and neuromuscular perspectives. A multi-layered framework is proposed that explains how coordination evolves from highly variable, energetically inefficient movement patterns in early childhood to highly optimized and stable motor behaviors in adulthood. The study also highlights age-related decline in coordination efficiency due to neuromuscular degeneration and reduced proprioceptive acuity. Two analytical tables and a graphical model are presented to illustrate coordination efficiency trends and biomechanical indicators across developmental phases. This work contributes to sports science, rehabilitation biomechanics, and motor learning theory by providing a unified developmental model of coordination.