This chart was given to me by the late Carolyn Gallagher when I started my family research.
It is a helpful tool to use in determining birth year range when using the early census records

Census
Age		 1800 1810 1820 1830 1840
under 5 1825-1830 1835-1840
5-10 1820-1825 1830-1835
under 10 1790-1800 1800-1810 1810-1820
10-15 1815-1820 1825-1830
10-16 1784-1790 1794-1800 1804-1810
15-20 1810-1815 1820-1825
16-18 1802-1804
16-26 1774-1784 1784-1794 1794-1804
20-30 1800-1810 1810-1820
26-45 1755-1774 1765-1784 1775-1794
30-40 1790-1800 1800-1810
40-50 1780-1790 1790-1800
over 45 bef 1755 bef 1765 bef 1775
50-60 1770-1780 1780-1790
60-70 1760-1770 1770-1780
70-80 1750-1760 1760-1770
80-90 1740-1750 1750-1760
90-100 1730-1740 1740-1750
over 100 bef 1730 bef 1740
In the 1850, 1860, 1870 & 1880 census, individuals were asked for their age at last birthday on day of census, 1 June.
In the 1900 census, individuals were asked for month & year of birth
In the 1910 & 1920 census, individuals were asked for age at last birthday on the day of census

Back to Webster County Census page