Levene enrolled at Columbia University and in his spare time conducted biochemical research, publishing papers on the chemical structure of sugars. In 1896 he was appointed as an Associate in the Pathological Institute of the New York State Hospitals, but he had to take time off to recuperate from tuberculosis.
This graph shows the median age of the resident population of the United States from 1960 to 2015. In 2015, the median age of the United States population was approximately 37.7 years.
20.7%12.4% 0.05.010.015.020.025.02000 2010 2020 2030 2040 2050 Percent According to U.S. Census Bureau population projections, 20.7% of the population will be 65 years or older by 2050. Source: U.S. Census Bureau, âU.S. Interim Projections by Age, Sex, Race, and Hispanic Originâ (2004).