Final answer:
Persons aged 18-24 are the most likely to be uninsured in the U.S. due to factors like transitional life stages and low employer coverage. Medicare covers those 65 and older, and many under 18 are eligible for children's health programs.
Step-by-step explanation:
The age group most likely to be uninsured in the United States is persons aged 18-24. While Medicare provides health insurance for those 65 and older, and many individuals under 18 are eligible for Medicaid or the Children's Health Insurance Program, those aged 18-24 often lack insurance. This can be due to being in transition phases, such as attending college or starting careers, which may not offer health insurance. Additionally, this age group has one of the lowest voter turnouts, which may affect their representation in policy decisions impacting healthcare access.