Not all scientific discoveries are made in a scientist's youth. The noted American botanist Benjamin Minge Duggar reached the pinnacle of his career in 1948, when he discovered and introduced the use of the broad-spectrum tetracycline antibiotics - at the age of seventy-six.
Duggar, Benjamin Minge (?- ) American botanist [noted for his discovery and introduction of the use of the broad-spectrum tetracycline antibiotics]