Table 5. Hypothetical distribution of total spending among three age groups under the age and sex structure of selected calendar years.

Type of expenditure and age	Calendar year
	1978	2000	2020	2040
Median age of population	29	36	39	41
	Percent distribution
Hospital
Total	100	100	100	100
Under 19 years	9	7	6	5
19-64 years	63	61	56	45
65 years or over	28	32	38	50
Physician
Total	100	100	100	100
Under 19 years	15	12	10	10
19-64 years	60	62	59	54
65 years or over	25	26	31	36

SOURCE: Health Care Financing Administration, Office of the Actuary: Data from the Division of National Cost Estimates.