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Different theories about why divorce might occur include the following: the disillusionment model, where lovers only had an illusion of love in the first place; the maintenance hypothesis, where couple are simply working to maintain their illusions about one another; and, the social exchange and behavioral theories, where problems steadily begin to escalate out of control.

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Furthermore, a history-graded change might be due to how your age affects what cohort of people you might be considered a part of.

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A type of physical change that is age-graded is the degradation of our reproductive systems. A cognitive change that occurs is the alteration of memory, declining in some circumstances.

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Well-being has also been found to relate to several other things. Some of these things include thinking optimistically, actively coping, finding meaning, having a set of core values, physical exercise, and social support. Furthermore, meditation has proven to release stress, decentering from problems at hand.

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Life satisfaction is proposed in self-determination theory to arise from the needs for these 3 things. Autonomy refers to the feeling of control in one’s life. Competence refers to showing one’s own skills in the things they do. And relatedness refers to the respect and admiration one gets from others. The fulfillment of these needs has also been shown to positively affect one’s physical and mental health.

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These features of a couples’ reaction to one another have been thought to lead to marriage dissolution. The four horsemen of the apocalypse are criticism, defensiveness, contempt, and stonewalling.

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Many studies have shown the many benefits of a healthy marriage. Some would even say that it is better to be married. However, this may end in divorce which would be unhealthy for a family, unless there was a hostile relationship in the first place.

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Steinberg proposed that we define love base on three different elements. These are intimacy, passion, and commitment. Based on the presence of absence of these elements, we come to a different type of love, where consummate love has all three elements.

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Duvall showed the average amount of years that we spend in each stage of the life cycle. Something that he categorized the life cycle into was by the age of the child, whether they were a teen or eventually being launched.

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People who show higher rates of creativity, production, and a sense of care for the following generation are shown to have greater self-esteem. They are also reported to show high levels of happiness.

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By old age, hopefully the mind is able to reflect on life and come to conclusions that show meaning to that specific life or that life had an order to it. He is called a keeper of meaning according to another notable scholar named Vaillant. However, if the mind cannot conceive this Erikson hypothesized that despair ensues.

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Although the body may change less and less, there are characteristics that are presumed to stay with us throughout our entire life. These are called the Big 5 and include neuroticism, extraversion, openness, agreeableness, and conscientiousness.

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There are 3 types of change that researchers tend to characterize adaptions by. These include age-graded (ones that are a factor of time), history-graded (ones that are factor of historical circumstance), and nonnormative (ones that are a factor of chance) changes. Also, late adulthood spawns many new changes including the loss of friends, mental issues such as dementia, and age discrimination.

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Through middle and late adulthood, the body stops growing as much as it did during younger years. Regulation of loss becomes another adaptive feature of the body that adjusts and lowers our standards of functioning.

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At the start of one’s life, biology plays a big role in growth and development. As the body decays, culture starts to become a more essential support in terms of well-being. Biology, in older age, starts to work against the natural processes on the body.

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This theory proposes that self-realization lies at the core of well-being.

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This process begins with mate selection and continues throughout that process of child-bearing to the point upon which we help in the family life cycle of our own children. We reach retirement and then death.

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Our development of a sound view of our life’s work and accomplishment has a large effect on our well-being.

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This development theory provides a framework for the organization of all of life's processes.