Recent research in this field has focused on improving the accuracy and granularity of population estimates, particularly in areas where traditional census data may be outdated or unavailable.

The table shows the number and percentage of older adults in each age group: 60+, 65+, and 85+. The chart shows how the proportion of older adults in the population changes over time.

This paper constructs new life tables for the American Indian population in the late nineteenth and early nineteenth centuries, thus pushing back the availability of age-specific mortality and life ...