Function booklibrs::actions::read::change::full::change_age

pub fn change_age(
    reader_base: &mut ReaderBase, 
    book_system: &mut BookSystem, 
    genres: &Genres, 
    caretaker: &mut Caretaker, 
    app: &App, 
    lang: Lang
)

Function that changes reader’s age. If you have mistakes in input, program will let you know