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What is the decline in kidney function between the ages of 20 and 90?

Between the ages of 20 and 90, average kidney function, as measured by the glomerular filtration rate (GFR), declines by approximately 50%. This gradual reduction is a normal aspect of healthy aging, though the rate of decline can vary significantly among individuals and be accelerated by other health conditions. Understanding what is the decline in kidney function between the ages of 20 and 90 is crucial for proactive health management.