From the majority of our lives, our minds and bodies are engaging in some kind of work. This isn't just limited by the work we do in our jobs; it also includes the work we do for ourselves, our families, and our communities.
From even before the moment we are born, our minds and bodies are growing. When we are born, we must start surviving as an independent bodies. However, this doesn't mean that we don't have any assistance. Compared to our closest animal relatives, we mature much slower, taking almost twice as long. The longer development time in conjunction with our brain structure allows human to develop much more complex structures and abstract thought. It allows time for our emotions to mirror those around us, the foundation for our social logic. As we grow, we develop deeper and more complex though processes built on the work of those before us. This is our strength. While as individuals, it is unfathomable that we could develop anything close to modern math, science, or technology in a lifetime, as a societal mesh, we are able to continuously innovate and preserve this understanding through generations.
Our formative years are mainly spent on ourselves and integrating with our immediate society.