This research examines how employees acquire professional skills through a combination of internal peer learning and external formal training over the course of their careers. Research indicates that informal knowledge sharing among colleagues is most vital during early career stages, whereas structured external programs peak in importance during mid-career. These distinct learning trajectories significantly impact lifetime earnings, workforce productivity, and the widening gap of wage inequality. The research argues that modern shifts toward remote work threaten essential early-career development by disrupting spontaneous office interactions. Consequently, organizations are encouraged to adopt strategic interventions, such as cohort-based onboarding and stage-specific training budgets, to optimize human capital. Ultimately, the research provides a framework for leaders to align talent management with the natural evolution of how adults learn.

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