16 years old
14-16 depending on your workers permit
16
You can sell them or just take them apart for fun. When I have old electronics i like to take it apart just to see how it works. Its pretty fun when your bored but be careful because some electronics...
You can be as old as you want but you have to be at least 16 or older to workout at a gym like the world gym in Fayette and peachtree city