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What Are Normal Blood Sugar Levels by Age? (The Complete Chart)

04 Sep 2025 by Hon-Chi Lee, M.D., Ph.D.

What Are Normal Blood Sugar Levels by Age? (The Complete Chart)

Understanding normal blood sugar levels is crucial for maintaining good health, especially when considering the different ranges that apply to various age groups. Fluctuations in blood sugar can indicate underlying health issues, such as diabetes or prediabetes. This article provides a comprehensive guide to normal blood sugar ranges by age, along with factors that influence these levels and when to seek medical advice.

Why Blood Sugar Levels Matter

Blood sugar levels, also known as blood glucose levels, represent the amount of glucose present in your blood. Glucose is your body's primary source of energy, derived from the food you eat. Maintaining stable blood sugar levels is vital because:

  • Energy Regulation: Ensures a steady supply of energy for your cells and organs.
  • Organ Function: Supports the proper functioning of your brain, heart, and other vital organs.
  • Disease Prevention: Helps prevent or manage conditions like diabetes, which can lead to serious complications such as heart disease, kidney disease, and nerve damage.

Normal Blood Sugar Levels By Age: The Complete Chart

It's important to note that normal blood sugar levels can vary based on factors like age, time of day, and whether you've recently eaten. Here’s a detailed chart outlining typical ranges:

Age Group Fasting Blood Sugar (mg/dL) 2 Hours After Eating (mg/dL) Target HbA1c (%)
Children (Under 6) 80-200 Up to 200 6.5-8.5
Children (6-12) 80-180 Up to 180 6.5-8.0
Teenagers (13-19) 70-150 Up to 140 6.5-7.5
Adults (20+) - Non-Diabetic 70-99 Less than 140 Less than 5.7
Adults (20+) - Diabetic 80-130 Less than 180 Less than 7.0 (as advised by a doctor)
Seniors (65+) - Non-Diabetic 70-110 Less than 140 Less than 5.7
Seniors (65+) - Diabetic 80-140 Less than 180 Less than 7.5 (as advised by a doctor)

Note: These values are general guidelines. Individual targets can vary based on overall health and treatment plan. Always consult with a healthcare professional for personalized recommendations.

Understanding the Terms

  • Fasting Blood Sugar: Blood sugar level measured after at least 8 hours of fasting (no food or drinks except water).
  • 2 Hours After Eating: Blood sugar level measured two hours after the start of a meal.
  • HbA1c: A blood test that measures your average blood sugar levels over the past 2-3 months. It's used to monitor blood sugar control in people with diabetes.

Factors Influencing Blood Sugar Levels

Several factors can affect your blood sugar levels:

  • Diet: Carbohydrate intake has the most significant impact on blood sugar. Foods high in refined carbohydrates can cause rapid spikes.
  • Physical Activity: Exercise helps lower blood sugar by increasing insulin sensitivity and using glucose for energy.
  • Stress: Stress hormones can raise blood sugar levels.
  • Medications: Certain medications, such as steroids, can affect blood sugar.
  • Illness: Infections and other illnesses can lead to fluctuations in blood sugar.
  • Age: As you age, your body may become less efficient at regulating blood sugar.
  • Hydration: Dehydration can sometimes cause an increase in blood sugar concentration.

Symptoms of High and Low Blood Sugar

Recognizing the symptoms of both high and low blood sugar is essential for timely intervention: The Ultimate Blood Sugar Diet 20 Foods That Help You Take Control

Hyperglycemia (High Blood Sugar):

  • Frequent urination
  • Increased thirst
  • Blurred vision
  • Fatigue
  • Slow-healing sores

Hypoglycemia (Low Blood Sugar):

  • Shakiness
  • Sweating
  • Dizziness
  • Confusion
  • Irritability
  • Hunger

When to See a Doctor

It's important to consult a healthcare professional if you experience any of the following:

  • Frequently elevated blood sugar levels.
  • Symptoms of diabetes (excessive thirst, frequent urination, unexplained weight loss).
  • Difficulty managing blood sugar, despite lifestyle changes or medication.
  • Recurring episodes of hypoglycemia.
  • Changes in vision or other complications related to diabetes.

A doctor can conduct tests, such as a fasting plasma glucose test, oral glucose tolerance test, or HbA1c test, to accurately assess your blood sugar levels and determine if treatment is needed. Decoding Your Results Normal A1C Level Vs Prediabetes A1C Range

Tips for Maintaining Healthy Blood Sugar Levels

Adopting a healthy lifestyle can significantly impact your blood sugar control:

  • Eat a Balanced Diet: Focus on whole, unprocessed foods, including fruits, vegetables, lean proteins, and whole grains. Limit sugary drinks and refined carbohydrates.
  • Exercise Regularly: Aim for at least 150 minutes of moderate-intensity exercise per week.
  • Monitor Blood Sugar Regularly: If you have diabetes or prediabetes, check your blood sugar as directed by your healthcare provider.
  • Stay Hydrated: Drink plenty of water throughout the day.
  • Manage Stress: Practice relaxation techniques such as meditation or yoga.
  • Get Enough Sleep: Aim for 7-8 hours of quality sleep per night.
  • Follow Your Doctor's Advice: Adhere to your prescribed medication and treatment plan.

Conclusion

Maintaining normal blood sugar levels is vital for overall health and well-being. Understanding the age-specific ranges and factors influencing these levels empowers you to take proactive steps in managing your health. Regular monitoring, a healthy lifestyle, and consultation with healthcare professionals are key to ensuring stable blood sugar and preventing related complications. By prioritizing blood sugar control, you can enhance your energy levels, protect your organs, and promote long-term wellness. The Philosophical Approach To Living With A Chronic Condition

References and Further Reading