In the Episode of The Big Bang Theory, The Cooper-Hofstadter Polarization, Leonard mentions that Sheldon got his Ph.D. at the age of 16.
However in the episode of The Jerusalem Duality, Sheldon mentions that he got the Stevenson award at the age of 14 and a half.
So, why does this award mention Sheldon Lee Cooper, Ph.D. as he got his Ph.D. at the age of 16?
Here is a screenshot. (though I could not get the clear one.)