she's FAR from a love interest.
she's basically like a daughter after a while. one he is stuck with. kind of the street urchin with reluctant older man thing.
far from a love interest. there's no interest at all from either.
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This was also the days before viagra! Back then once you were in your 50's, you were finished in most cases!

Even though Arabella does develop a crush on Jack as the film goes on, I wouldn't call her a love interest. Probably 99.9% of the movie he seems pretty clueless about even starting a romantic relationship with her. Unless you think they might have developed a sexual relationship after the movie.
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I think it's kind of chemistry between the two lead actors, it is not easy to find a good bond for both male and female to get away with in movies.

That seems to be a cliche of the movie with an aging cop. Clint Eastwood and Burt Reynolds did it a lot too.

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