i started working at 13, and since then, i've been working 25+ hours during the school year, and 50+ hours during the summer.
also, i make $9 an hour now at my current job, (off the books) which is nice money for a kid.
i've made about 30k, i have substantial savings and i spend money on consumables like its going out of style.
my family isnt rich or anything, but my dad makes a nicely comfortable living for us, so i work and its all mine, i dont work cause i need to or anything.
its very possible. having the incentive to do something, and the ambition to keep going is the best thing anyone could have. i'm very lucky to have that quality.
but my spending ways are coming to a close i feel.. i have to save a little more for a car for the spring, and then like you said, insurance, gas...