|Birth Day||May 15, 1845|
|Age||174 YEARS OLD|
|Died On||Jul 15, 1916 (age 71)|
Passionate about natural sciences, he tested and taught
He is often credited with coining the term gerontology, which describes the study of aging and longevity.
His first wife, Ludmilla Feodorovitch, succumbed to tuberculosis; he met his second wife, Olga, two years later.
Louis Pasteur and he worked in the same field, but they had their disagreements.