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Studying life span development is important for many reasons. If we know about the cognitive, psychosocial, and biological processes of development it will help us understand human growth and development. The processes of development help us figure out about our health too.
It's also important to learn, because it teaches about risk factors affecting fetuses and genetic characteristics. We learn about health habits affecting longevity and how our genetic make-up plays a roll in our health. Knowing life span development helps us learn about mental and physical health issues.
Check out the link below for more information. The following quote is from the link below.
"Adaptation throughout life depends on how each of us negotiates the internal and external factors that enhance or constrain our abilities to reach our full potentials. The essence of life span development is in how we build our strengths to transcend these limitations over time."
Like the previous answer stated, there are many reasons to study the lifespan of a people. Reflection will yield more reasons than can be answered in a short post.
First, from an educational point of view, knowing the development of a child can help enormously in developing academic curricula. For example, there is no use in introducing abstract concepts at an age when children cannot grasp abstract concepts.
Second, from a medical point of view, especially in that area of prevention, learning the development of a person can be of great value. For example, if a common disease or ailment is common in men in their 40s, then checking men in their 40s for this disease can be an important preventive measure. This can not only save a person's health but also save many tax dollars.
Third, developmental insight also helps religious officials. If you think about the sacramental system of the Catholic church, it is based on the lifecycle of a person - birth to death.
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