Most require one to be 18, at least at most larger airports and companies. Just walk in and apply. Don't wear a shirt and tie (it's not that meticulous of a job), but a nice collared shirt and pants. Be polite to whom ever you speak to because managers usually ask employees what they thought of "the guy who applied today" and word will get back to the big boss and he makes the decisions. Finally, FBO's cater to the rich and famous, so remember to shave.
Yes, among many other things like towing, ice, coffee, newspapers, walking customer's dogs, shuttling pilots/pax to terminal, cutting grass, FOD checks, testing and taking in fuel loads from tankers, answering phones, making popcorn, iced tea, lemonade, cleaning crew cars, fueling and maintaining equipment, sumping trucks, and being a slave (to management, pilots and pax). How's that?
