Using census tracts is a useful way to obtain birth dates. Knowing birth information will greatly improve your chances of finding your genealogy on the
Internet.
Genealogy Search
Census tracts since 1850 list either the age or date of birth of each
person in a household. The exception was the 1890 Census which was largely
destroyed in a 1921 fire. The tracts are available in microfilm. If you are
searching the state in which you live, you probably can find the tracts at you
state historical library.
If you would like to view census tracts online, here are some
options. (The indexed census tracts will usually make your searching easier.)