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.
median age of the global population, that is, the age at which half the population is older and half is. younger, is 29.6 years. About one-quarter (26 per cent) of the worldâs people are under 15 years of age, 62 per cent are aged 15-59 years, and 12 per cent are 60 or over.