Hello! Bassist here, 7+ years. Ibanez Soundgear SR300FM

Bass is the most fun you'll have with guitar. It's simple to get into, and once you get the hang of it the sky's the limit. I started out with bass when I was in 6th grade, and have been playing since now (I'm 20). It helped me get into a regular guitar, but I love my bass more than any other stringed instrument.
Easiest way to get into it? YouTube some tutorials on proper technique with plucking and fretting, get your posture right (or else carpel tunnel!) and then learn your favorite song. Err, learn a song you know - don't try to start out with Fly By Night or Teen Town or something...
Get used to scales too. Scales are important, once you know where things are on the neck naturally you start to learn way quicker and play way better. Then you can start to improv which is super fun.