We easily see that the shape of the histogram is roughly symmetrical and that the center is about age 60. The category with the highest frequency, which is also called the modal class, is the age group 60 - 69, with a frequency of 12. The range of values is about 80.
Note that the horizontal scale (x-axis) of the histogram shows only the lower values of each class (20, 30, 40, etc.). This serves to keep the histogram uncluttered and easier to interpret.