Frederick Banting was (and still is) the youngest (age 32 in 1923) Nobel Laureate. He discovered insulin in 1922 with colleagues of his. This canadian revolutionised treatment of type 1 diabetes and has essentially save millions of lives.
The first patient to receive insulin, initially called isulet – as it was taken from the islets of Langherhans in the pancreas and experimentally given to dogs with diabetes, was a young boy aged 14 and he had an allergic reaction to the first injection. The scientists went back to work to purify it further. The second injection was a success!
The young patient as well as so many others were spared what had been the fate of a type 1 until 1923.