The aging process varies widely in different individuals and in different organs within a particular individual. 是什麼意思

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It means the process of aging, getting old differs from person to person. Every person gets old differently, some get old painfully while some get old in a healthy way. Moreover, the process of getting old also differs from organs to organs. For example, your heart may function as it was functioning in your 20's when you are 60 years old, however, your lungs may function like a 80 years old's lungs.