Final answer:
Children under the age of 18 have the highest percentage of poverty compared to other age groups in the U.S., whereas seniors over sixty-five have seen a decrease in poverty since the 1960s.
Step-by-step explanation:
The age category of the U.S. population with the highest percentage of people in poverty is children under the age of 18. According to provided poverty rates from various years, including Table 14.1 and Table 15.1 from 2011 and 2013 respectively, it is clear that other age categories, such as seniors over age sixty-five, have seen a decrease in poverty rates over the years, especially since the 1960s when nearly 35% of the elderly lived in poverty-level incomes. In 2011, the poverty rate appears to have peaked at 15.9% overall, but the rates among the elderly were relatively low when compared to other groups. Conversely, children consistently exhibit higher rates of poverty compared to other age groups.