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At what stage in life does the body function at optimal level? Early adulthood explained

Research consistently shows that humans typically reach their physical and cognitive peak during early adulthood. This period, generally spanning the early 20s to mid-30s, is when the body achieves maximum strength, endurance, and physiological efficiency. Knowing at what stage in life does the body function at optimal level can inform lifestyle choices that support long-term health and well-being.