B It probably depends on their sense of humor and tolerance for romantic comedies. If they can't buy into Zellweger being the title British character, the film may feel like an endurance test. Bridget's life never seems too idle, and there's always a problem or three that she has to deal with. It may be bad for her, but it keeps the audience from getting bored. Compared to the rest of the film, the love triangle subplot seems to be tacked on at times.
Characters begin doing things just to get into more and more embarrassing situations.
B Depends on the teen's sense of humor. Teens may not get some of the dryer wit. If Glenn Close getting gunned down in another film can be played as a joke, teens should know what they're getting into. Zellweger carries the majority of the film, but the supporting cast does manage to hold up their own ends of the plot without looking bad, except for a home shopping host, but I think that's intentional. It's probably a step or two classier than the current crop of romantic comedies and is far better in getting intentional laughs.