Normal Blood Sugar Levels by Age Chart
Know normal blood sugar levels by age, know the normal levels, how it changes with age, symptoms of unbalanced sugar and how to maintain a healthy blood sugar level.
Written by Dr. Siri Nallapu
Reviewed by Dr. Shaik Abdul Kalam MD (Physician)
Last updated on 4th Aug, 2025
Introduction
Maintaining healthy blood sugar levels is essential for overall well-being, especially as we age. Blood sugar, or glucose, is the primary source of energy for our body’s cells. However, when levels are too high or too low, it can lead to health complications, including diabetes.
This article explains normal blood sugar levels for different age groups, why they matter, and how you can keep them in check.
What Are Normal Blood Sugar Levels?
Blood sugar levels vary depending on age, health conditions, and whether you’ve eaten recently. Here’s a general guideline for normal blood sugar levels:
Fasting Blood Sugar (Before Eating)
Adults (18+ years): 70–99 mg/dL
Children & Teens (under 18): 70–100 mg/dL
Older Adults (65+ years): May be slightly higher (80–130 mg/dL) due to age-related changes
Post-Meal Blood Sugar (2 Hours After Eating)
Adults & Children: Less than 140 mg/dL
Older Adults: Less than 160 mg/dL
HbA1c (Average Blood Sugar Over 3 Months)
Normal: Below 5.7%
Prediabetes: 5.7%–6.4%
Diabetes: 6.5% or higher
Consult a Top diabetic specialist
Why Do Blood Sugar Levels Change with Age?
As we grow older, our body’s ability to regulate blood sugar may decline due to:
Reduced insulin sensitivity, which is a hormone that controls blood sugar.
Slower metabolism
Lifestyle factors like diet, activity levels
Other health conditions like high blood pressure, cholesterol.
Children and teens may experience fluctuations due to growth spurts, hormones, and activity levels.
Symptoms of Unbalanced Blood Sugar
High Blood Sugar (Hyperglycemia)
Frequent urination
Increased thirst
Fatigue
Blurred vision
Slow-healing wounds
Low Blood Sugar (Hypoglycemia)
Shakiness or dizziness
Sweating
Hunger
Confusion
Rapid heartbeat
If you experience these symptoms often, consult a doctor for proper evaluation.
How to Maintain Healthy Blood Sugar Levels?
1. Eat a Balanced Diet
Choose whole grains, lean proteins, and healthy fats.
Limit sugary foods, refined carbs, and processed snacks.
Include fibre-rich foods (vegetables, fruits, legumes) to slow sugar absorption.
2. Stay Active
Exercise regularly (walking, yoga, strength training).
Aim for at least 150 minutes of moderate activity per week.
3. Monitor Blood Sugar Regularly
If you have diabetes or prediabetes, check your levels as advised by your doctor.
Use a glucometer or continuous glucose monitor (CGM).
4. Manage Stress & Sleep Well
Stress raises blood sugar—practice meditation or deep breathing.
Get 7–9 hours of sleep to help regulate insulin.
5. Stay Hydrated
Drink plenty of water to help the kidneys flush out excess sugar.
6. Avoid Smoking & Excessive Alcohol
Both can disrupt blood sugar control.
When to See a Doctor?
Consult a healthcare provider if:
Your fasting blood sugar is consistently above 100 mg/dL.
You experience frequent high or low blood sugar episodes.
You have a family history of diabetes.
Early detection and management can prevent complications like heart disease, nerve damage, and kidney problems.
Final Thoughts
Keeping blood sugar levels in a healthy range is crucial at every age. By making smart lifestyle choices, monitoring regularly, and seeking medical advice when needed, you can reduce the risk of diabetes and enjoy better health.
Consult a Top diabetic specialist
Consult a Top diabetic specialist
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