Bogart and 29-year-old Lauren Bacall fell in love when they filmed To Have and Have Not ( 1944 ) and soon after the main filming for The Big Sleep ( 1946 ) , their second film together , concluded in early 1945 , he filed for divorce from his third wife and married Bacall .
Humphrey Bogart fell in love with a woman aged under 20 years in 1944 .