hobbies vs. interests

After having a great weekend fishing, and hanging out with some buddies fishing for trout in Branson, I have a question in my mind that has been driving me crazy all weekend. I know that fishing is viewed as a hobby by most, but what really separates an interest from a hobby? Because it's possible to have an interest in a hobby, but can it be the other way around? Is a hobby defined by the frequency of the activity, or just the desire to participate in a specific activity. If golf for instance was once something that you played every week for years, but now you haven't played in years..... can you still tell people that it is your hobby, because you still intend to play again. Whats the time limit when golf just goes back to an interest? If one has a desire / interest to learn, and experience life to it's fullest potential by being curious about all things in this world, and beyond, can this too be listed as a hobby? If this is so, then we could possibly say that living is a hobby. Maybe that is why people say not to take life to seriously. Nobody would want to turn their hobby into a job!