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A1c by age
Search for an A1c chart by age and you will find many. Here is what the guidelines actually say: the normal range does not change with age, but goals for older adults with diabetes do.
The short answer
- Normal A1c is below 5.7% at every adult age. The ADA's cut points for normal, prediabetes and diabetes have no age bands, and they are the same for men and women (ADA Standards 2026, sec. 2).
- A1c tends to creep up with age, even in people without diabetes. In two large US studies it rose about 0.01 to 0.014 points per year of age (Pani 2008).
- Goals for older adults with diabetes depend on health, not age alone. The ADA suggests below 7.0% to 7.5% for healthy older adults and below 8.0% for those with complex health (ADA Standards 2026, sec. 13).
Normal A1c for every adult age
These are the diagnostic ranges. They apply to a 30-year-old and an 80-year-old alike (ADA Standards 2026, sec. 2). Average glucose comes from the ADAG formula (Nathan 2008).
| Category | A1c | Estimated average glucose |
|---|---|---|
| Normal | Below 5.7% | Below 117 mg/dL (6.5 mmol/L) |
| Prediabetes | 5.7% to 6.4% | 117 to 137 mg/dL (6.5 to 7.6 mmol/L) |
| Diabetes | 6.5% or higher | 140 mg/dL or higher (7.8 mmol/L) |
Does A1c increase with age?
Yes, a little. A 2008 study looked at adults without diabetes in the Framingham Offspring Study (2,473 people) and in NHANES 2001 to 2004 (3,270 people). A1c was higher in older age groups, and this held even after leaving out people with impaired fasting glucose or impaired glucose tolerance (Pani 2008).
| Study group (no diabetes) | Rise per year of age | Top of range, under 40 | Top of range, 70 and older |
|---|---|---|---|
| Framingham Offspring | 0.014 points | 6.0% | 6.6% |
| NHANES 2001 to 2004 | 0.010 points | 5.6% | 6.2% |
"Top of range" is the 97.5th percentile: 97.5% of people in that age group had an A1c at or below it (Pani 2008). Simple arithmetic on the yearly rise: over the 40 years from age 30 to 70 it adds up to about 0.40 to 0.56 points.
The authors concluded that more research is needed before deciding whether age-specific cut points would be appropriate (Pani 2008). Until then, the same ranges apply to everyone. So an older adult with an A1c of 5.9% is in the prediabetes range by the ADA definition, even though values like that are common at that age.
A1c goals for older adults with diabetes
The ADA Standards of Care section on older adults sets goals by health status, not by birthday (ADA Standards 2026, sec. 13). For most nonpregnant adults with diabetes the usual starting goal is below 7% (ADA Standards 2026, sec. 6). For older adults the ADA suggests:
| Health status | Reasonable A1c goal | Same goal as average glucose |
|---|---|---|
| Healthy: few, stable chronic illnesses, intact thinking and daily function | Below 7.0% to 7.5% below 53 to 58 mmol/mol | 154 mg/dL (8.6 mmol/L) to 169 mg/dL (9.4 mmol/L) |
| Complex or intermediate: several chronic illnesses, 2 or more limits in daily activities, or mild to moderate cognitive impairment | Below 8.0% below 64 mmol/mol | 183 mg/dL (10.2 mmol/L) |
| Very complex or poor health: long-term care, end-stage illness, moderate to severe cognitive impairment, or 2 or more limits in daily activities | No A1c goal: avoid relying on A1c | Decisions aim to avoid low blood sugar and symptoms of high blood sugar |
Goals and health groups from ADA Standards 2026, Table 13.2 (ADA Standards 2026, sec. 13). The ADA notes that not everyone fits neatly into one group, and that a lower goal can be set if it is reached without repeated or severe low blood sugar. Average glucose by the ADAG formula (Nathan 2008); mmol/mol by the NGSP master equation (NGSP).
Why the goal is often looser after 65
- Low blood sugar is a bigger risk. Older adults with diabetes have a greater risk of hypoglycemia, especially on insulin, sulfonylureas or meglitinides, and the ADA asks clinicians to check for it at routine visits (ADA Standards 2026, sec. 13).
- The benefit depends on time. The ADA links stricter goals to a longer remaining life expectancy, and says people with very complex or poor health get little benefit from stringent goals (ADA Standards 2026, sec. 13).
- Health changes over time. The ADA notes that a person's health and preferences can change, so the goal can be revisited (ADA Standards 2026, sec. 13).
When A1c is less reliable in older adults
A1c can be inaccurate after a blood transfusion and with conditions that change red blood cell turnover. The ADA names kidney failure, recent significant blood loss and erythropoietin therapy as such conditions that are common in older adults, and suggests glucose monitoring or CGM for goal setting in those cases (ADA Standards 2026, sec. 13). More in when A1c can mislead.
What about children and pregnancy?
The diagnostic cut points above are for adults. Goals for children and teens, and for pregnancy, are set in separate ADA sections and are not covered here. NIDDK notes that A1c early in pregnancy can reflect months before the pregnancy (NIDDK).
Sources
- American Diabetes Association Professional Practice Committee. 2. Diagnosis and Classification of Diabetes: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1). doi.org/10.2337/dc26-S002
- American Diabetes Association Professional Practice Committee. 13. Older Adults: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1):S277-S296. doi.org/10.2337/dc26-S013
- American Diabetes Association Professional Practice Committee. 6. Glycemic Goals, Hypoglycemia, and Hyperglycemic Crises: Standards of Care in Diabetes 2026. Diabetes Care. 2026;49(Suppl 1). doi.org/10.2337/dc26-S006
- Pani LN, Korenda L, Meigs JB, et al. Effect of aging on A1C levels in individuals without diabetes: evidence from the Framingham Offspring Study and the National Health and Nutrition Examination Survey 2001-2004. Diabetes Care. 2008;31(10):1991-1996. doi.org/10.2337/dc08-0577
- National Institute of Diabetes and Digestive and Kidney Diseases (NIH). The A1C Test & Diabetes. www.niddk.nih.gov/health-information/diagnostic-tests/a1c-test
- Nathan DM, Kuenen J, Borg R, Zheng H, Schoenfeld D, Heine RJ; A1c-Derived Average Glucose (ADAG) Study Group. Translating the A1C assay into estimated average glucose values. Diabetes Care. 2008;31(8):1473-1478. doi.org/10.2337/dc08-0545
- NGSP. IFCC Standardization of HbA1c: the IFCC and NGSP master equation (NGSP = 0.09148 x IFCC + 2.152). ngsp.org/ifccngsp.asp
Written and maintained by the controla1clevels.com editorial team. We do not have a medical reviewer; every claim links to its primary source above. Last reviewed: 2026-10-26. Spotted an error? See About.