Kidney Function Older Than 70: What Is Normal and How to Protect Your Kidneys

Introduction

As people get older, their bodies naturally change, and the kidneys are no exception. Understanding kidney function older than 70 is important because kidney filtering ability may gradually decrease with age.

Many adults over 70 have lower kidney function than younger people. However, this does not automatically mean they have chronic kidney disease (CKD).

The good news is that regular kidney testing, healthy lifestyle habits, and appropriate medical care can help older adults maintain their kidney health and quality of life.

1. How Does Kidney Function Change After Age 70?

The kidneys filter waste products, remove excess fluid, regulate electrolytes, and help control blood pressure.

As people age, kidney tissue and blood vessels may undergo natural changes. The number of functioning filtering units can decrease, making the kidneys less efficient.

According to the National Kidney Foundation, average eGFR levels gradually decline with age. The average eGFR for adults aged 70 and older is approximately 75 mL/min/1.73 m².

However, individual kidney function varies considerably.

Other factors that may affect kidney health include:

• High blood pressure.
• Type 2 diabetes.
• Cardiovascular disease.
• Dehydration.
• Long-term use of certain medications.
• Family history of kidney disease.

Age alone does not determine whether someone has CKD.

2. What Is a Normal eGFR for Someone Older Than 70?

The estimated glomerular filtration rate (eGFR) is one of the most important measurements used to evaluate kidney function.

It estimates how efficiently the kidneys filter waste from the blood.

Here is a general guide:

• 90 or higher: Normal or high filtration, although other signs of kidney damage must be considered.
• 60–89: Mildly reduced filtration.
• 45–59: Stage 3a CKD range.
• 30–44: Stage 3b CKD range.
• 15–29: Stage 4 CKD range.
• Below 15: Kidney failure range.

An eGFR below 60 for at least three months may indicate CKD.

However, doctors should interpret these results alongside urine albumin levels, medical history, and changes over time.

For example, an otherwise healthy 75-year-old with an eGFR of 65 may have a different risk profile from someone with diabetes and significant albumin in their urine.

3. Signs of Reduced Kidney Function in Older Adults

Early kidney disease often develops without noticeable symptoms.

As kidney function declines, some older adults may experience:

• Persistent fatigue and weakness.
• Swelling in the ankles, feet, or legs.
• Changes in urination frequency.
• Foamy urine.
• Reduced appetite.
• Muscle cramps.
• Difficulty concentrating.
• Shortness of breath due to fluid buildup.

These symptoms can also result from other medical conditions.

If you notice persistent or worsening symptoms, consult a healthcare professional rather than assuming they are simply part of aging.

4. How to Protect Kidney Function After Age 70

Although aging cannot be reversed, several healthy habits may help protect kidney function.

Control Blood Pressure

High blood pressure can damage the small blood vessels inside the kidneys. Monitor your blood pressure regularly and follow your healthcare provider’s recommendations.

Manage Blood Sugar

For older adults with diabetes, maintaining appropriate blood glucose levels can help reduce kidney damage.

Follow a Balanced Diet

Choose nutritious foods, including vegetables, fruits, whole grains, and appropriate portions of protein.

People with CKD may need individualized recommendations for sodium, potassium, phosphorus, protein, and fluid intake.

Stay Physically Active

Walking, gentle stretching, and other appropriate exercises can support cardiovascular health and overall well-being.

Avoid Kidney-Harming Medications

Certain pain relievers, particularly NSAIDs such as ibuprofen and naproxen, may increase the risk of kidney injury, especially in older adults.

Ask your healthcare professional or pharmacist before using these medications regularly.

5. Kidney Health Products and Helpful Tools for Seniors

Older adults managing kidney health may benefit from educational resources and practical tools.

Learn More About Chronic Kidney Disease

Understanding CKD, kidney-friendly habits, and treatment options can help patients make informed decisions.

Discover additional kidney health information and educational resources through this CKD health guide.

Monitor Blood Pressure at Home

A reliable upper-arm blood pressure monitor can help seniors keep track of their readings between medical appointments.

Explore digital blood pressure monitors on Amazon.

Make Food Portions Easier to Manage

A digital kitchen food scale can help measure ingredients and follow portion recommendations provided by a kidney dietitian.

Explore digital kitchen food scales on Amazon.

Remember that these products are supportive tools, not treatments for kidney disease. Always discuss new supplements or kidney health programs with a healthcare professional before using them.

6. When Should Adults Over 70 Get Kidney Tests?

Older adults with diabetes, high blood pressure, cardiovascular disease, or other kidney disease risk factors should discuss appropriate kidney testing with their healthcare providers.

Common tests include:

• Serum creatinine blood testing.
• Estimated glomerular filtration rate (eGFR).
• Urine albumin-to-creatinine ratio (uACR).
• Blood pressure monitoring.

Tracking these results over time can help identify changes and guide treatment decisions.

For more information, visit the National Kidney Foundation’s guide to aging and kidney disease.

Conclusion

Understanding kidney function older than 70 can help seniors take better care of their health.

Although kidney filtration naturally changes with age, reduced kidney function should not automatically be dismissed as normal aging.

Regular medical checkups, blood pressure control, diabetes management, balanced nutrition, and appropriate medication use can all contribute to better kidney health.

Taking small steps today may help older adults maintain independence and enjoy a better quality of life.

Medical Disclaimer: This article is for educational purposes only and does not replace professional medical advice, diagnosis, or treatment. Kidney patients should consult their healthcare providers before changing their diet, medications, fluid intake, or supplements.

Affiliate Disclosure: CKD Online may earn a commission when readers purchase products through affiliate links in this article. This does not increase the purchase price. Affiliate products are not intended to diagnose, treat, cure, or prevent kidney disease.