Early Watch Tower Question

Most information gives Ann Eliza (Birney) Russell's, the mother of Charles Taze Russell, age at time of death as 29 in 1861. A copy of an Allegheny census lists her age as 26 in 1850. The new video produced by the Watchtower, Bible, and Tract Society mentions Joseph and Eliza immigrated to America in 1845. If she was 29 when she died, she would only be 13 in 1845. A little young to be married. Does anyone have any information that seems to substantiate the 1850 census that she was actually born in 1824 instead of 1832? Thanks for your help.

Looking for author B. W. Shulz. Interested in his upcoming book about the history of the
Watch Tower.