31.   Finally, the average age of the American population is increasing, and that means more medical bills.

32.   For a variety of reasons, the average age of new-car buyers is rising even faster than the average age of the overall population.

33.   For similar reasons, the results of each group were not adjusted for differences in the average age and income of members.

34.   How many here can guess the average age of a school building in the United States?

35.   However, as in the huge Roman Catholic Church, the average age of mainline clergy is graying.

36.   I was a little surprised, because I thought the average age of the champions was kind of old.

37.   I mean, the average age of Web users is rising?

38.   In addition, the average age of women playing with Game Boys has increased.

39.   In the U.S., the company said, the average age of its customers is older than the average age of the population.

40.   Its crime rate is low, its average age high and its main street Main.