Genealogy: 1910 Census birth year reference chart

census birth yearBy Barry J. Ewell
As you track your ancestor through the U.S. Federal Population Censuses, you can use age to help you

  • Identify individual members of the family
  • Provide clues to confirm I have the right person/family unit as you search each census
  • Provide clues as to relationship in the family
  • Provide clues if I have the right female when surnames change through marriage
  • Provide clues when people use nicknames and other name variations from one census to the next

I have prepared a birth year reference chart for each census to help you identify an estimated birth year for each ancestor.  This article will focus on the 1910 U.S. Federal Population Census.

Learn more about information about age found in the census:

1910 U.S. Census birth year reference chart
In Column 7 of the 1910 US Population Census, learn the age of each member of the household.  The following chart will provide the approximate corresponding birth year for the age provided.

Age calculated as of April 15, 1910.

AgeBirth YearAgeBirth YearAgeBirth Year
Mar 0/121910281882671843
Feb 1/121910291881681842
Jan 2/121910301880691841
Dec 3/121909311879701840
Nov 4/121909321878711839
Oct 5/121909331877721838
Sep 6/121909341876731837
Aug 7/121909351875741836
Jul 8/121909361874751835
Jun 9/121909371873761834
May 10/121909381872771833
Apr 11/121909391871781832
11909401870791831
21908411869801830
31907421868811829
41906431867821828
51905441866831827
61904451865841826
71903461864851825
81902471863861824
91901481862871823
101900491861881822
111899501860891821
121898511859901820
131897521858911819
141896531857921818
151895541856931817
161894551855941816
171893561854951815
181892571853961814
191891581852971813
201890591851981812
211889601850991811
2218886118491001810
2318876218481011809
2418866318471021808
2518856418461031807
2618846518451041806
2718836618441051805

Census taker instructions for age on 1910 Census
The following are the exact instructions given to census taker (enumerator):

110. Column 7. Age at last birthday.-This question calls for the age in completed years at last birthday. Remember, however, that the age question, like all other questions on the schedule, relates to April 15, 1910. Thus a person whose exact age on April 15, the census day, is 17 years, 11 months, and 25 days should be returned simply as 17, because that is his age at last birthday prior to April 15, although at the time of your visit he may have completed 18 years.

111. Age in round numbers.-In many cases persons will report the age in round numbers, like 30 or 45, or “about 30” or “about 45,” when that is not the exact age. Therefore, when an age ending in 0 or 5 is reported, your should ascertain whether that is the exact age. If, however, it is impossible to get the exact age, enter the approximate age rather than return the age as unknown.

112. Ages of children.-Take particular pains to get the exact ages of children. In the case of a child not 2 years old, the age should be given in completed months, expressed as twelfths of a year. Thus the age of a child 3 months old should be entered as 3/12, a child 7 months old as 7/12, a child 1 year and 3 months as 1 3/12, etc. If a child is not yet a month old, enter the age as 0/12. But note again that this question should be answered with reference to April 15. For instance, a child who is just a year old on the 17th of April, 1910, should nevertheless be returned as 11/12, because that is the age in completed months on April 15.