What are some good hobbies for 14 year old boys?
besides computer stuff
try rock climbing.
What are you interested in? Elaborate from there. If you like the outdoors, try Boy Scouts (no it is NOT too late to join!) if you like sports, try for track or basketball. If you like computer stuff, do computer stuff!
Making money by buying and selling things. Buy things online, at garage sales, thrift stores, when they are on sale, etc. A good hobby that is actually productive.