Final answer:
Figure A6 and Table A4 show the U.S. population distribution by age groups for 1970, 2000, and 2030, indicating shifts in demographic trends and their potential impacts on society.
Step-by-step explanation:
Figure A6 and Table A4 provide a detailed demographic breakdown of the U.S. population by age groups for the years 1970, 2000, and projections for 2030.
The data categorize the population into children (birth to 18 years), working age adults (19 to 64 years), and the elderly (65 years and above), with actual numbers and percentages depicted. This helps to illustrate changing population trends and can be instrumental in understanding the implications for areas such as healthcare utilization, policy-making, and socioeconomic planning, especially considering the aging population and potential dependency ratios.