The longevity of human life is influenced by genetics, the environment, and lifestyle. Environmental improvements beginning in the 1900s extended the average life span dramatically with significant improvements in the availability of food and clean water, better housing and living conditions, reduced exposure to infectious diseases, and access to medical care. The average person born in 1960, the earliest year the United Nations began keeping global data, could expect to live to 52.5 years of age. Today, the average is 72. 

Life-span views embrace the joint influences of multiple factors on memory development, including the important roles of environment interactions at different stages of the life. From a social-cultural perspective, these adult differences in autobiographical memory should be related to specific socially organized activities earlier in development. 

When we repeat memories like in childhood (with the daily questions like "tell your grandma about your day" or "what happened in the park"), the leave a mark in our memory palace. That is the basic reason we are remembering our childhood in adult life. Memory is our past and future. To know who you are as a person, you need to have some idea of who you have been. "Our memory is our coherence," wrote the surrealist Spanish-born film-maker, Luis Buñuel, "our reason, our feeling, even our action". But when we look at how memories are constructed by the brain, the unreliability of memory makes sense. In storyboarding an autobiographical memory, the brain combines fragments of sensory memory with a more abstract knowledge about events, and reassembles them according to the demands of the present. 

According to latest researches, in some cases older adults have been found to be falsely confident about the accuracy of their recognition memory. They tended to be overconfident, relative to younger adults, in the accuracy of their errors. This “misrecollection” is due to the poor performance of frontal functions according to neuropsychological tests. 


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