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How do scientists explain the ageing process?

aging is a gradual, continuous process of natural change that begins in early adulthood.  during early middle age, many bodily functions begin to gradually decline.  people do not become old or elderly at any specific age.  traditionally, age 65 has been designated as the beginning of old age.

Explanation:

many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.