Approximately 2.1 million people in the United States have diagnosed type 1 diabetes, according to the CDC’s National Diabetes Statistics Report. That includes about 1.8 million adults aged 20 and older and 314,000 children and adolescents under 20. Out of the roughly 29 million Americans with diagnosed diabetes of any kind, type 1 accounts for a relatively small share, though among children it tells a very different story.
How Type 1 Compares to Total Diabetes Numbers
The 2.1 million figure sits alongside a much larger number: 40.1 million Americans living with diabetes overall (including undiagnosed cases). Type 1 makes up a small fraction of the total, but its distribution across age groups is uneven. Among children and teens under 18, type 1 accounts for about 86% of all diabetes cases. In adults, it’s far less common than type 2, which is why type 1 is sometimes mistakenly thought of as a childhood-only disease.
More Than Half of New Cases Are in Adults
One of the most widely misunderstood aspects of type 1 diabetes is who gets diagnosed. Recent epidemiological data show that more than half of all new type 1 diagnoses occur in adults, not children. This challenges the old name “juvenile diabetes” and has practical consequences: adults with new-onset type 1 are frequently misdiagnosed with type 2, which can delay the insulin therapy they need from the start.
Rising Rates in Children and Young Adults
New diagnoses among young people have been climbing steadily. In 2002, about 20 out of every 100,000 young people were newly diagnosed with type 1 each year. By 2018, that number had risen to 22 per 100,000, roughly a 2% annual increase. The reasons for this trend aren’t fully settled, but environmental triggers, viral infections, and changes in early childhood exposures are all areas of active investigation.
The increase is not spread evenly across racial and ethnic groups. Incidence is rising especially fast among Hispanic and Black young adults aged 18 to 25. And beyond diagnosis rates, there are significant disparities in outcomes. In one study of young adults with type 1, Black participants had average blood sugar levels (measured by A1C) more than two percentage points higher than white participants, even after adjusting for age, sex, and how long they’d had diabetes. That gap translates to a meaningfully higher risk of complications over time.
Projected Growth Through 2060
The number of young people under 20 living with type 1 is expected to keep growing. In 2017, roughly 185,000 youth had the condition. If diagnosis rates simply hold steady at 2017 levels, that number would rise modestly to about 191,000 by 2060. But if the upward trend observed between 2002 and 2017 continues, projections put the number closer to 306,000, a roughly 65% increase among youth alone.
Life Expectancy Has Improved Significantly
A type 1 diagnosis carries far less impact on lifespan than it once did. Research from the Pittsburgh Epidemiology of Diabetes Complications Study found that people diagnosed with childhood-onset type 1 in the 1950s and early 1960s had a life expectancy of about 53 years, more than 17 years shorter than the general population. For those diagnosed in the late 1960s and 1970s, life expectancy jumped to nearly 69 years, narrowing the gap to just 4 to 6 years.
Advances in insulin delivery, blood sugar monitoring, and complication management have continued since those cohorts were studied. People diagnosed today with access to modern tools like continuous glucose monitors and insulin pumps can expect outcomes that are better still, though the condition remains a daily management challenge that requires constant attention to blood sugar levels, insulin dosing, and diet.