In 1905, Levene was appointed as head of the biochemical laboratory at the Rockefeller Institute of Medical Research. He spent the rest of his career at this institute, and it was there that he identified the components of DNA.
It also takes anywhere from 18 to 24 months to get promoted to O-2 following entry to the Army, so the effective minimum age to join the Rangers for officers is around 23 to 24 years old. Officers can then continue to apply until they are promoted to O-5.
Some professions tend to be geared toward various age groups of workers and certain genders more than others. The average Army Corps Of Engineers age in the United States is 38 years old. As it pertains to men vs women, 49% of Army Corps Of Engineers are male in the United States, and 51% of the Army Corps Of Engineers are female in the United States.