What Are Normal Blood Sugar Levels by Age?

By Bridget Reed
Medically Reviewed by:

Heidi Wright, BSN, RN, PCCN, and Certified Master Herbalist

What Are Normal Blood Sugar Levels by Age?

November 03, 2023

Blood sugar, a common term that is often misunderstood, is a crucial indicator of our body's health and wellness. While blood sugar fluctuations are natural and tied to our diet and activity, consistent extremes can hint at deeper health challenges. 

As we journey through different life stages, our body's definition of "normal" for blood sugar evolves. Understanding this can be the key to unlocking a lifetime of well-being. Join us as we dive into the world of blood sugar — from its basics to its age-specific norms.

What Are the Basics of Blood Sugar?

At its core, blood sugar, or blood glucose, represents the amount of glucose present in our bloodstream. Glucose, a type of sugar, is the primary energy source for our cells, powering our daily activities and bodily functions. When we consume foods, especially those rich in carbohydrates, our body converts them into glucose. This glucose then enters our bloodstream, ready to be utilized by our cells. 

However, there's a gatekeeper: the pancreas. This organ releases insulin, a hormone that facilitates glucose's entry into cells

When this system operates smoothly, our energy remains steady, and we feel at our best. However, disruptions or imbalances can lead to either high or low blood sugar levels, both of which come with their own set of challenges. Understanding this balance is pivotal, ensuring we harness the best from what we eat while maintaining a harmonious inner health landscape.

What Factors Impact Blood Sugar?

Blood sugar levels are influenced by a range of factors — whether it's the meal you had for lunch or the brisk walk you took in the evening, many elements play a role. 

Here's a closer look at some of these influential factors:


Unsurprisingly, what you eat directly impacts your blood glucose levels. Consuming foods high in carbohydrates can lead to a rapid rise in blood sugar. Conversely, foods rich in fiber, protein, and healthy fats tend to have a more gradual impact, offering sustained energy.

Physical Activity

Engaging in regular exercise can aid in managing blood sugar by boosting insulin sensitivity. This means your cells can use available sugar more efficiently after a workout. However, it's worth noting that, on occasion, intense physical activity can lead to a temporary rise in blood sugar levels.


Stress, both physical and emotional, can elevate blood sugar. Stress hormones like cortisol can prompt the liver to produce more glucose, potentially tipping the scales toward hyperglycemia if not managed.


Certain medications, not just those for diabetes care, can affect blood sugar levels. It's essential to be aware of such side effects and work with a healthcare provider to monitor and adjust as needed.


When the body is unwell, it produces stress-related hormones to combat the illness, which can, in turn, raise blood sugar levels. Even a common cold can cause a temporary spike.


Alcohol can have a dual effect. While it may raise blood sugar shortly after consumption, it can also lead to hypoglycemia (low blood sugar) hours later, especially on an empty stomach.

Hormonal Changes

Hormones play a pivotal role in glucose regulation. Fluctuations during menstrual cycles, pregnancy (gestational diabetes), or other medical conditions can influence blood sugar.

Other Health Conditions

Conditions like high blood pressure and high cholesterol can interfere with the body's ability to utilize insulin, potentially leading to elevated blood sugar.

Being cognizant of these factors and understanding their influence is a crucial step in maintaining optimal blood sugar levels. 

What Are Average Blood Sugar Ranges Across Lifespan?

Our body's metabolic needs and its response to insulin, the hormone responsible for managing glucose, evolve as we age. This shift means that what's considered a 'normal' blood sugar level for a toddler isn't the same as for an older adult. As such, understanding these nuanced distinctions is key to ensuring health and vitality throughout the different stages of life.

Infants and Toddlers

In the earliest stages of life, blood sugar levels are generally lower. Normal fasting levels for this age group can range between 70 and 100 mg/dL. However, it's essential to ensure these levels don't drop too low, as infants and toddlers might not always communicate symptoms of low blood sugar effectively.

Children and Adolescents 

Before the onset of puberty, children's fasting blood sugar levels usually stay between 80 and 110 mg/dL. Engaging in regular physical activity and maintaining a balanced diet at this age is crucial for setting up healthy habits that can aid in glucose regulation as they grow.


Puberty brings about a rush of hormonal changes that can affect blood sugar levels. The normal fasting range for teenagers tends to lie between 70 and 120 mg/dL. It's worth noting that during this phase, the body may display a temporary reduction in insulin sensitivity, meaning more attention to diet and activity might be required.


For the average adult, fasting blood sugar should ideally remain under 100 mg/dL. Levels that stay elevated long-term between 100 and 125 mg/dL might indicate prediabetes, a stage where blood sugar is elevated but not high enough to be classified as type 2 diabetes. “Regular monitoring and lifestyle changes may help to return these elevated blood sugar levels back down to a normal level; however, sometimes the body becomes insulin resistant and requires additional support to keep the blood sugar balanced,” highlights Heidi Wright, a Registered Nurse and Certified Herbalist. 

Pregnant Women

Pregnancy introduces a unique set of metabolic challenges. While fasting blood sugar levels below 95 mg/dL are typically sought after, it's equally important to monitor post-meal levels, ensuring they remain under 140 mg/dL two hours after eating. Elevated levels can be indicative of gestational diabetes, which requires medical attention.

Older Adults

As we age, the body's insulin response can slow, making blood sugar management more challenging. A fasting level below 110 mg/dL is generally considered healthy for this age group. However, individual targets might vary based on overall health and the presence of other health conditions.

While these ranges provide a guideline, it's essential to remember that individual variations exist. The American Diabetes Association, among other health bodies, emphasizes the importance of personalized targets. Regularly checking blood sugar, especially if there are risk factors or symptoms of high or low blood sugar, is wise. 

Collaborating with a healthcare professional, a diabetes educator, or a dietitian ensures you're not only aware of your numbers but are also empowered with strategies to maintain them within the desired range, fostering wellness at every age.

What Tests and Monitoring Are Available for Blood Sugar?

Understanding your blood sugar levels is more than just knowing the numbers. It's about having the tools and knowledge to actively engage in your health journey. There are several tests and monitoring devices available to provide comprehensive insights into your blood glucose patterns and trends. 

Let's explore the essentials:

Fasting Blood Sugar Test

A fasting blood sugar test is a primary diagnostic tool. After an overnight fast, a blood sample is taken to measure the current glucose level. Typically, a level below 100 mg/dL is considered normal, while a level between 100 and 125 mg/dL might indicate prediabetes.

Oral Glucose Tolerance Test (OGTT)

For an oral glucose tolerance test, after fasting, you'll consume a sugary drink. Blood samples are taken at intervals to see how your body handles the excess sugar. It can help in diagnosing type 2 diabetes or gestational diabetes.

HbA1c (or A1C Test)

This test provides an average of your blood sugar levels over the past 2-3 months. It measures the percentage of blood sugar attached to hemoglobin. An A1C level below 5.7% is considered normal, while higher percentages indicate prediabetes or diabetes.

Random Blood Sugar Test

With a random blood sugar test, a sample is taken at a random time, regardless of when you last ate. Multiple random tests might be done throughout the day.

Continuous Glucose Monitor (CGM)

This device tracks blood sugar levels throughout the day and night. It can provide real-time data and alert you if your levels go too high or too low.


A glucometer is a portable device allowing individuals to check their blood sugar levels. By placing a small drop of blood on a test strip, the device offers a quick reading, helping users manage their daily activities and meals accordingly.

Blood Sugar Levels Chart

As a visual representation, this chart helps track patterns and fluctuations over time. Many healthcare professionals and diabetes educators recommend using such charts as part of comprehensive diabetes management.

Urine Tests

While not as precise as blood tests, urine tests can show if your body is excreting sugar in the urine, suggesting high blood glucose levels.

Regular monitoring, whether at home with a glucometer or through periodic check-ups with your healthcare provider, is pivotal. With the right tools and knowledge, you can confidently transverse the terrain of blood sugar management, ensuring optimal health and well-being.

What Are Some Tips To Support Healthy Blood Sugar Levels?

Navigating the ebb and flow of blood sugar can seem like a daunting task, but with some actionable strategies, you can maintain a healthy balance with greater ease. Let's explore some valuable tips that can guide you in this journey:

Balanced Diet

Focus on a diverse diet that includes fiber-rich foods, lean proteins, and healthy fats. Foods with a low glycemic index, such as whole grains and certain fruits, can be particularly beneficial as they release glucose slowly into the bloodstream.

Regular Physical Activity

Engage in consistent physical activity. Whether it's a brisk walk, yoga, or strength training, exercise helps improve insulin sensitivity, ensuring effective glucose utilization.

Monitor Carbohydrate Intake

Carbohydrates have a direct impact on blood sugar levels. By understanding and managing your carb intake, especially from sources like whole grains, legumes, and vegetables, you can better regulate blood glucose levels.

Stay Hydrated

Drinking ample water can aid in maintaining a healthy blood sugar range. Proper hydration supports kidney function, helping to flush out excess glucose through urination. Add a drop of our Organic Stevia Leaf Sweetener for a hint of sweetness.

Manage Stress

Find stress-relief techniques that resonate with you, be it meditation, deep breathing exercises, or hobbies. Managing stress can have a profound effect on stabilizing blood sugar levels.

Glucose Functional Tea

Sipping on a comforting cup of tea can be more than just a relaxing ritual. Our Glucose Functional Tea, caffeine-free and brimming with 12 naturally-selected ingredients, offers a flavorful way to support healthy blood sugar levels. It's an effortless yet delightful addition to your daily routine.

Regular Monitoring

Invest in a quality glucose monitor to keep track of your blood sugar. Frequent checks can provide insights, helping you understand how different foods or activities affect your levels.

Consult Healthcare Professionals

Always keep the lines of communication open with your healthcare provider or dietitian. Regular check-ups, understanding your blood sugar levels chart, and seeking advice when needed ensures you're on the right path.

The Bottom Line

Understanding blood sugar nuances can be challenging, but equipped with the right knowledge, it becomes a more straightforward path. This isn't solely about monitoring levels; it's about adopting a lifestyle focused on holistic well-being and health consistency.

At Herbaly, we strive to offer you detailed insights complemented by our Functional Teas. Armed with informed decisions and the warmth of our blends, managing glucose levels becomes an empowering experience.


Blood Sugar | Blood Glucose | Diabetes | MedlinePlus

Physiology, Glucose - StatPearls | NCBI Bookshelf

Pancreas Hormones | Endocrine Society

Aging and insulin secretion | American Journal of Physiology-Endocrinology and Metabolism

The Big Picture: Checking Your Blood Glucose | ADA

Type 2 diabetes - Symptoms and causes | Mayo Clinic

Mean fasting blood glucose | World Health Organization

Good to Know: Factors Affecting Blood Glucose | PMC

FOLLOW US @Herbaly