Final answer:
The age group with the most inactivity is the senior population, those aged 65 and above. This conclusion is based on demographic trends, showing an increase in the proportion of seniors and a decrease in the proportion of young people.
Step-by-step explanation:
According to the percentage of inactivity by age group, the age group with the most inactive people is likely the senior population, those aged 65 and above. This is supported by demographic data indicating that the U.S. population has been aging, with the proportion of seniors having tripled over the last century. Furthermore, the proportion of young people has decreased by over one-third. When considering the labor force, those at the age of 64 and older are typically considered too old to work and are therefore more likely to be inactive in this context. Additionally, political participation and the use of technology, such as e-readers, also vary by age, with older groups having higher political turnout but lower usage of e-readers compared to younger age groups.