the first grave was her husband, Frank Perkins. born in 1920 and died 1971. the second grave was a Sarah Perkins. born 1951 and died 1969. I assume that was their daughter who died at the age of 18, roughly the same age as Jane is in the movie.

I remember that I subtracted the years and got 18. I guess her age could have been anywhere from just 17 to almost 19.
I know that it said 1961, so that has to be the year of death, right? And I think it was the same year of death on the first grave.