I'm a month from 17 and have been doing strict Paleo since August of 2012. My parents buy the food thankfully, and my sister, a vegan, works at a organic food store thankfully where she gets a massive discount on locally grown, organic, grass-fed, and healthy foods, along as being able to bring home whatever she likes from the compost bin where a surprising amount of great produce gets put.
I'm very athletic. I'm in a weightlifting class at my highschool, varsity swimmer, varsity baseball player, and go to the local golds gym. I workout, in some form, six days a week.
As a teen, I find myself never being full haha. I'm constantly eating, but because of what I'm eating, I don't gain weight and don't feel bad eating it. I make all of my food myself. My mother and non-vegan sister don't mind it much. My dad gives me grief for it at times and I'm working to get him to converge as his weightloss has hit a wall. My friends all make jokes about it but I think its fun so I don't mind haha. When eating out, I eat regular food because I rarely ever eat out.