The best approach to answering this question:
Focus on the near term, covering the next two years. You can state broader goals of longer-term aspiration, but they should be mid-career goals, not end-of-career goals. For example, you should not state that you want to be President of the company one day (or any VP-level or above role, unless you are already at a Director level). While you might think that will define you as being big picture focused, most interviewers will view it as a level of expectation which likely cannot be met. So in spite of being able to do the job for which you are interviewing, you may be bypassed due to the fear on the part of the employer that they will not be able to meet your longer-term expectations for career growth. Keep it near term and keep it reasonable.