Looking up Leigh Corfman shows a birthdate of May 1964. That would make her 14/15 in 1979. Went to public records on the internet.
I did a little digging and found that her mother was born in June 1946 so that means she was shy of 18 when Leigh was born.
Also her mother (Nancy Cooper Corfman Wells) married Leigh's father (Robert Ray Corfman) in Feb 1963. So Leigh's mother was only 16 when she married.