I've been practicing. I am pretty horrible, though. I'll perhaps post a video of myself playing to prove it. Not today, though, tomorrow. I want to be at least a little less horrible.
I think the reason that so many kids learn musical instruments when they're young isn't just because their minds are fresh and spongy, it's also because they're innocent enough to be a bit unaware of how crappy they really sound. They get past that stage of totally sucking before they're held back by their own disgust at the sounds they produce. Someone learning to play an instrument is one of the most unmusical, grating sounds possible.
Practice when one is fine-tuning is another matter. I went to a university with a decent musical program and even though I didn't play an instrument, I'd lug my books to the music hall rather than the library to study. I'd find a quiet spot in the audience seats and listen to different performances. Music majors would schedule the stage space for practice sessions. Most of the time they wouldn't even know I was there. I didn't want to get kicked out, so I made sure to stay quiet. It was inspiring to listen to the live music, even if it did occasionally distract me from my assignments.
Right now my guitar playing is the opposite of inspiring. It's downright repelling.