The report, "The Older Population: 2010" also indicates that in 1900 approximately 4% of the U. S. Population was made up of individuals who were 65 years or older, while in 2010 this same age group made up about 13% of the population. Make sure that you fill in each answer area before checking "How Did I Do?". The proportion of the U. S. Population that is 65 years or older increased by Number percentage points from 1900 to 2010. The proportion of the U. S. Population that is 65 years or older increased by Number % from 1900 to 2010.