Cynthia Lynn Sumpter has been missing from San Jose, California, since April 27, 1974. Her photo above (right) shows age-progression to 53 years, but she would be 57 now. The last time Cynthia was seen, she was playing outside barefoot in the front yard of the apartment where she and her mother lived. Her nickname is “Cindy,” and she was only 5 years old when she vanished.…