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At what age does EGFR start to decline? The normal and accelerated drop in kidney function

According to the National Kidney Foundation, the average eGFR is 116 mL/min/1.73 m² for adults aged 20-29, but drops to 75 mL/min/1.73 m² for those 70 and older. This reflects the natural aging process, which inevitably raises the question: **At what age does EGFR start to decline?** Most evidence indicates that a slow, steady decrease in estimated glomerular filtration rate (eGFR) typically begins after a person reaches 30 to 40 years old.