Normal eGFR Range by Age: What Is a Good Kidney Function Number?

The normal eGFR range changes with age, but there is no single “good” number that applies to every person. eGFR tends to decline gradually with age, and a result should be interpreted using the laboratory reference, urine albumin, health history, and the trend over time.

Use our eGFR by age calculator to compare a result with typical age-related values, then use the CKD stage calculator to see the formal G1-G5 range.

Typical eGFR values by age

Published population estimates vary, but a commonly cited approximate pattern is:

These are averages, not diagnostic thresholds. A healthy individual can fall above or below an average because of body size, muscle mass, genetics, and measurement variation.

The averages also depend on who was included in the study, which creatinine assay and equation were used, and whether people with kidney risk factors were excluded. For those reasons, the table is best used as context, not as a target to “beat” or a substitute for a laboratory reference range.

Is a lower eGFR normal in older adults?

Sometimes. An eGFR of 60-89 can be age-related, particularly when urine albumin and urinalysis are normal. However, persistent eGFR below 60, a rapid decline, or evidence of kidney damage deserves clinical follow-up at any age.

Age does not change the formal G1-G5 boundaries. Instead, it changes the probability that a given result reflects expected population variation and influences the balance of risks, other illnesses, and treatment goals. A clinician should not dismiss a low or falling value solely because a person is older.

Age average versus CKD category

Why age charts should not replace testing

eGFR is calculated from serum creatinine and other variables. Dehydration, high meat intake, intense exercise, supplements, medicines, and acute illness can change creatinine. Urine albumin-to-creatinine ratio (UACR) often adds important information that an age chart cannot provide.

Track laboratory values using the same units and note the date. A trend in your own results is usually more useful than comparing yourself with a population average.

A practical way to read an age chart

Start with the laboratory-reported eGFR, not a manually re-created estimate. Compare it with prior results from similar health conditions, then check urine albumin and other markers. Use the age table only as a final piece of context. If an online age comparison and a clinician's interpretation differ, the clinical interpretation has access to information the chart does not.

No food, supplement, or hydration strategy should be used simply to move a result toward an age average. Treating the cause and controlling established risk factors is more meaningful than optimizing a single estimated number.

This article is educational information, not medical advice. Discuss an unexpected, persistent, or falling eGFR with a qualified healthcare professional.