In a survey, 26 voters were asked their ages. The results are shown below. Construct a frequency polygon to represent the data (with 5 classes beginning with a the first data midpoint of 24.5 and a class width of 10). What is the lower class limit of the sixth class?

64, 63, 30, 35, 62, 41, 68, 24, 42, 42, 27, 29, 20, 26, 45, 45, 30, 26, 47, 32, 66, 57, 65, 46, 36, 24