Hello Barb,
a database of all families in Aschwarden is available under:
hhtp://db.genealogy.net (in English language too).
Therein is mentioned Oltmann Hinrich`s date of birth, namely May 17, 1846.
Also his siblings, parents and grandparents are specified. His grandfather
Oltmann Schwarting was born abt. 1776 in Etzhorn (Oldenburg).
Regards,
Albin von Spreckelsen