Loss of Memory, Intelligence, Mental tolerance

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Memory is the faculty of the brain by which data or information is encoded, stored, and retrieved when needed. It is the retention of information over time for the purpose of influencing future action. If past events could not be remembered, it would be impossible for language, relationships, or personal identity to develop.
Memory loss is usually described as forgetfulness or amnesia. You may not be able to remember new events, recall one or more memories of the past, or both.The memory loss may be for a short time and then resolve (transient). Or, it may not go away, and, depending on the cause, it can get worse over time. Memory loss that disrupts daily life may be a symptom of Alzheimer's or other dementia. Alzheimer's is a brain disease that causes a slow decline in memory, thinking and reasoning skills.
It's highly possible to decrease your intelligence. There could be different factors that may have affected your intelligence. These factors could be both natural or external ones. Ageing causes changes to the brain size, vasculature, and cognition.
The nervous system detects environmental changes that impact the body, At the cellular level, the nervous system is defined by the presence of a special type of cell, called the neuron, also known as a nerve cell. Neurons have special structures that allow them to send signals rapidly and precisely to other cells. The central nervous system functions to send signals from one cell to others, or from one part of the body to others and to receive feedback