A1C 5.8: What Seniors Should Know and What to Do Next

In this article: 

• An A1C of 5.8% falls in the prediabetes range (5.7%–6.4%)—a zone that millions of American seniors are in right now, and one that can often be addressed with lifestyle changes.
• The ADA's 2026 Standards of Care emphasize setting *individualized* goals for older adults, which means your 5.8 A1C should be discussed in the context of your full health picture.
• Small, consistent lifestyle shifts, like breaking up sitting time, choosing high-fiber carbohydrates, losing a small amount of weight, and strengthening muscles, can help lower blood sugar levels over time.
• Medicare covers a structured prevention program (MDPP) for eligible seniors with prediabetes, and research suggests it can meaningfully reduce the risk of progressing to Type 2 diabetes.
• Lark's MDPP is a free, Medicare-covered program that can be done from home—check your eligibility in minutes at the end of this article.

When you check your lab results and see that you have an A1C of 5.8 or 5.9, it’s normal to feel a mixture of emotions. You may wonder, “Am I prediabetic?” or, “Am I going to get diabetes?” Many people even believe that there’s nothing they can do about their blood sugar or the future of their health. But they’re wrong!

The truth is that there’s a lot you can do for your blood sugar now and for the future. In addition, many of the healthy actions you can take are simple choices on a daily basis - and research suggests shown that lifestyle changes work! 

The Medicare Diabetes Prevention Program (MDPP) is a program specifically designed to help seniors make lifestyle changes to prevent or delay the onset of type 2 diabetes - and it’s a covered benefit for many Medicare recipients! Here’s what you should know about being a senior with an A1C 5.8 or 5.9, and what to do next. 

Is an A1C of 5.8% Considered Prediabetic?

What is A1C? Before looking at what the prediabetes range is and where 5.8 fits in, it helps to understand what A1C measures. The A1C test is also known as the HbA1c or hemoglobin A1C test. It is a measure of your average blood sugar levels over the past three months. Your A1C test result shows the percentage of your red blood cells that have sugar, or glucose, coated on them.

A blood sugar or blood glucose test that you get in the lab or using a fingerstick shows your blood glucose at that moment in time. It can go up or down depending on factors like whether you ate on the morning of the test, or if you’re mildly dehydrated. However, the A1C test gives an overall picture of your blood glucose levels over that past 2-3 months. It’s more stable than a blood glucose measurement. 

The American Diabetes Association (ADA) breaks down A1C into categories. An A1C of 5.8% is in the prediabetes range - higher than normal, but not as high as in the diabetes range. Any value 5.7 to 6.4% is prediabetic. Under that is normal, while 6.5% and higher is in the diabetes category.

Understanding A1C 5.8 vs. A1C 5.9 in Older Adults

When talking about A1C for seniors, there isn’t much difference between an A1C of 5.8 and an A1C of 5.9%. Both are in the prediabetes range. Having an A1C at one of these levels is a sign that your body has some insulin resistance - insulin doesn’t do its job as well to take sugar from the bloodstream and get it into cells. That means more glucose is being left in your bloodstream, leading to high blood glucose levels. 

An A1C of 5.8 or 5.9 is at the lower end of the prediabetes range, and it’s a good time to take action. With a few changes now, seniors can significantly prevent or delay diabetes and other health risks related to high blood sugar. 

An action item if your A1C is high is to ask your healthcare provider what your goal A1C is. The American Geriatrics Society explains that A1C targets for seniors are individual, not one size fits all. 

Health Risks: Why Am I Prediabetic and What Does It Mean?

When you get your lab results, the first question you may want answered is, “Am I prediabetic?” If your A1C is 5.8 or 5.9, and your doctor says you have prediabetes, it’s normal to start wondering why it happened. 

For seniors with prediabetes, blood sugar and insulin resistance may be related to sarcopenia, or loss of muscle mass. Muscle is metabolically active, and it uses a lot of glucose from your blood. When muscle mass goes down, it uses less glucose and leaves more in the blood. Muscle mass naturally decreases with age, which is one reason that it’s important to ask your healthcare provider about strength training exercises for health.

Prediabetes is a warning sign that you’re at risk for developing diabetes, but it’s also a risk factor for other conditions. Kaiser Permanente explains that health risks of prediabetes can be caused by damage to blood vessels due to high blood sugar. High blood glucose levels can lead to heart health risks due to blood vessel damage. In addition, high blood sugar can harm small blood vessels that supply the eyes and kidney, leading to risks in those organs. 

How to Lower A1C 5.8 Prediabetes Level: Five Steps

Your daily choices can make a big difference in your A1C and overall health! Here are five steps that can help lower A1C. 

1. Lose extra body weight. As little as 5-10% can make a big difference in diabetes risk. 
2. Get moving on a regular basis. An especially effective tactic is to break up sitting time with light movement throughout the day.
3. Strengthen muscles. Building strength and muscle mass has benefits like reducing injury risk, but it also helps lower blood sugar and A1C. Talk to your provider about safe exercises. 
4. Try higher-fiber carbohydrates. Try whole grains, beans, and starchy vegetables like peas, corn, and sweet potatoes instead of refined carbs. Look for fruit as a sweet alternative to sugar-sweetened desserts. Fiber helps support blood sugar control 
5. Check out a MDPP. It may be a covered benefit for seniors, and a coach can help you reach your goals.  

How the Medicare Diabetes Prevention Program (MDPP) Can Help

The Medicare Diabetes Prevention Program (MDPP) is a year-long lifestyle change program for seniors. It includes goals of a modest amount of weight loss as well as achieving physical activity guidelines. 

MDPP eligibility includes having a prediabetes A1C (like 5.8 or 5.9), as well as being in Medicare Part B or Medicare Advantage. It’s a covered benefit for many members, and in 2026, an MDPP may be virtual! That means you can participate from your computer or phone - no commuting needed.  

See If You Qualify at No Cost to You

Lark's Medicare Diabetes Prevention Program offers personal health coaching delivered right to your phone - built around the same CDC-recognized program that showed a 71% risk reduction in adults over 60. There is no cost to eligible Medicare members. 

Lark can help you stay on track with your weight and health goals as you log, track, and chat. Your Lark coach is available 24/7 for encouragement, nutrition and physical activity coaching, and habit tracking. Lark can help you make healthy choices and establish habits that fit into your lifestyle so you can lose weight and keep it off with or without GLP-1 medications. 

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Click here to see if you may be eligible to join Lark MDPP or another Lark program today!

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