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Start a new major hobby every year while maintaining your old hobbies. It will keep you busy and by keeping you busy it will keep you out of trouble and teach you discipline.
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Holy cow. Spoken like a single, childless man!
I have a wife and young children, a house and a job. I wish I had time for my old hobbies, let alone new ones!!
Ahh, you are making the mistake of assuming that all hobbies must be expensive, or work, or that time consuming. You are also making the age old middle class assumption that you have less time than you really do.
-Not all hobbies are work. Just one possible example, collecting baseball cards and doing the background research on the players is no work at all if you love baseball.
-Not all take money you might need for other things. Excercise can be free, or at least cheap. Some types of collections aren't that expensive. Learning to be a good cook, well you have to eat and prepare your food anyway.
-Time. Cooking, you have to prep your food anyway, and who says you must make a gourmet meal every meal. Some hobbies only need an hour a week, or month, or sometimes less to maintain. Camping, just camp when you go on vacation. Golf, take an hour every couple weeks to go golfing or to the driving range. Collections (any), take an hour or two at a set time to look at, plan, research your collection.
-You probably have more time than you think. Most Americans are very inefficient with their use of time. How much time do you spend on the computer or watching TV? Most Americans could open up an hour, two, or even more by simply limiting themselves to an hour of TV a day. Keep a calender, plan your day better, limit TV, put a time limit on the internet. Any one or two of those and you might find an hour, two, or more per week, or even per day that you didn't know you had.