Select 1880 United States Census Type only the surname of the family member born between 1800-1840 you are trying to locate
In the birth year you type 1800. In the birth range you select + or - 20 years. Census state PA (if that is where your family member lived) ---- That takes care of anyone born between 1800-1820 ~~~~~~~~~~~~~~ Then you follow the same procedure but this time you type 1820 for the birth year. In the birth range,you select + or - 20 years. That will cover the individuals born between 1820 and 1840. Add the two lists and you have the names of those individuals who were alive in 1880. ~~~~~~~~~~~~~~~~ You could search for anyone born before 1800 also by following this procedure.