Read the following premise and answer if the hypothesis is true.
Sanford Koufax ( ; born Sanford Braun; December 30, 1935) is a former American Major League Baseball (MLB) left-handed pitcher. He pitched 12 seasons for the Brooklyn/Los Angeles Dodgers, from 1955 to 1966. Koufax, at age 36 in 1972, became the youngest player ever elected to the Baseball Hall of Fame.
Hypothesis: Sanford Koufax regretted leaving baseball when he retired.. Is the answer "Yes", "No", or "It's impossible to say"? Respond with only the answer and no additional text.
It's impossible to say
It's impossible to say. There is no information provided in the premise about Koufax's feelings regarding his retirement.