I think at any age you can have this as long as you know how to use the computer ,
How do you know when your addicted ..
1 - Your on it all day and you have not done anything else .
2 - You get angry if someone tells you to get off it
3 - When you rather spend time on the computer then with your family
4 - When your off the computer your thinking about what your missing , when your going to be back on .