Too old for the cell phone Family Plan?

Well to save money for starters. I know I am trying to stay on my family plan as long as I can go unnoticed BUT at the same time if you know you are good with your finances and you can afford a line it IS a great credit building technique to have your own line. Just make sure you don't go overboard and want to pay for the "Unlimited everything under the sun" plan if you dont need and won't use all the features.