David was born in 1819. He was the son of Ebenezer Whittemore. He passed away in 1888.
Sources
"New Hampshire Birth Records, Early to 1900," database with images, FamilySearch (https://familysearch.org/ark:/61903/1:1:FL55-J8Q : 10 March 2018), David Richards Whittemore, 31 Jul 1819; citing Salisbury, Merrimack, New Hampshire, United States, Bureau of Vital Records and Health Statistics, Concord; FHL microfilm 1,001,052.