Kaley Cuoco is 38 years and 11 month(s) old. She was born in 30 Nov, 1985. Kaley Cuoco may be a name you are not real familiar with, but if you said Big Bang Theory and Penny everyone would instantly know who you were talking about. Cuoco has acted in several movies and in other successful series, but her fame has come from her role as the loveable next door neighbor to Sheldon and Leonard on the Big Bang Theory.