Robert Ford's Grave Marker...

I found this to be extremely interesting...I found a photograph of Robert Ford's grave,and his marker states that he was born in 1841 and died in 1892....now,that would have made him 51-years-old when he was killed and also OLDER than Jesse when he met him! I don't know what to make of this because according to all records,Bob was born in 1862....so did someone purposely mess up on his marker...did Bob fake his death....or is this the wrong grave????