On average, GFR decreases by 10 per decade starting from age 20.
According to National Kidney Foundation (NKF), the average estimated GFRs for different ages are shown below. Note that these are just averages and there is a lot of individual and racial variabilities.
- Age 20-30: 116 mL/min/1.73m2
- Age 30-40: 107 mL/min/1.73m2
- Age 40-50: 99 mL/min/1.73m2
- Age 50-60: 93 mL/min/1.73m2
- Age 60-70: 85 mL/min/1.73m2
- Age 70+: 75 mL/min/1.73m2
Further Reading / Reference
Weinstein JR, Anderson S. THE AGING KIDNEY: PHYSIOLOGICAL CHANGES. Advances in chronic kidney disease. 2010;17(4):302-307. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2901622/