Very old nuns?

Source: http://www.flickr.com.Uploaded to Flickr by Henk Gianotten and tagged with "albertus" and "monotypealbertus". License: All Rights Reserved.

This grave is on the cemetery St. Elisabeth in Lage Vuursche/Baarn (NL). It seems that the 2 oldest nuns were born in 1806 and 1809 and died in 1974. More than 165 years! This must be two typos. I think.