"I still get a lot of material but I find that as one gets older you get more fussy. You know you're going spend a year or a year and a half on this and you know there are only so many films in you so you get a little bit more selective"

This quote by Norman Jewison speaks with the idea that as one gets older, they end up being more selective in the material they select to deal with. Jewison is recommending that as one ages, they become more aware of the amount of time and effort that enters into producing a film, and as an outcome, they become more selective in the material they choose to deal with. This is likely due to the reality that they comprehend that they just have a limited quantity of time and energy to commit to developing a movie, and so they end up being more critical in the material they pick to work with. Jewison's quote also speaks with the idea that as one ages, they end up being more knowledgeable about the quality of the material they are dealing with, therefore they become more selective in the material they select to deal with. This is likely due to the truth that they comprehend that the quality of the material they pick to deal with will have a direct effect on the quality of the movie they produce.