I mowed lawns as a younger teen and worked at a local pizza place at 16.

As a side note, I remember coming to the realization that I actually had some money after a few weeks of mowing lawns. I was fortunate enough that my parents covered living expenses, so my pay could all be spending money for me. I of course knew that working = pay, but the first couple times you have a couple hundred bucks in your pocket that you can spend as you please is a liberating feeling.