Tombstone Tuesday - Jonathan & Melinda Sanford

Jonathan Sanford, Melinda Woodworth & their children

Another tombstone from Berwick Cemetery. The top of this gravestone is lying on the ground.  Jonathan Sanford would be a distance cousin of Robert.  The gravestone in inscribed:

JONATHAN SANFORD

1792 - 1883.

HIS WIFE

MELINDA WOODWORTH

1796 - 1865.

THEIR CHILDREN

BERTIE

1860 - 1862.

LINDIE

1862 - 1873.

As I look at this gravestone, I was baffled by the dates of birth of the children.  Melinda would be in her 60 if she had these children.  Is this an error or is there some other explanation?