Final answer:
Voter turnout in presidential elections is a topic in the field of Social Studies, involving the analysis of percentages of different populations that vote. Turnout rates vary over time and among demographic groups.
Step-by-step explanation:
Voter turnout in presidential elections is a topic in the field of Social Studies. It involves analyzing the percentage of the voting-age population, voting-eligible population, and politically eligible population that actually vote. The information provided indicates that voter turnout in the United States has varied over time and differs among different demographic groups.
For example, the graph from the United States Census Bureau shows that voter turnout rates were highest for voters age 65 and over and lowest for voters age 18 to 29. It is important to note that there is a difference between eligible voters and registered voters, as not all eligible voters are registered and not all registered voters actually vote.
Understanding voter turnout is crucial for evaluating the health of a democracy and identifying potential barriers or disparities in political participation.