Rohrdorf was first mentioned in 788 in the so called notitia arnonis.
Settlements have been proofed also in prehistoric time.
See also:
http://www.rohrdorf.de
... non-families. 19.0% of all households are made up of individuals and 7.0% have someone living alone who is 65 years of age or older. The average household size is 3.10 and ...