Junius, Jr.'s daughter Blanche was born in 1844, so the age fits. I found this on a site that perpetuates the myth Booth escaped.
"Blanche DeBar Booth was the daughter of Junius (Jr.) Booth, John Wilkes' brother. After Lincoln was assassinated, Blanche was interviewed by a Missouri state law enforcement officer who described her as "an unmitigated rebel" and "possessed of considerable personal attractions, of a vigorous mind and marked histrionic ability."
It also has a voice recording of Blanche.
http://www.wadeburleson.org/2013/01/a-re...debar.html
"There are few subjects that ignite more casual, uninformed bigotry and condescension from elites in this nation more than Dixie - Jonah Goldberg"