I find that as I get older, my tolerance for boredom has become lower and lower. When I was younger, I used to be able to just sit and think. Now I dread long drives because the sheer boredom of it drives me crazy. And it gets even weirder, because although I don't like social interaction that much, I find myself craving "going out and doing something" every night because the thought of just sitting inside watching a movie is painful.
I blame the internet. My attention span and focus are noticeably worse than they used to be, and I feel like I need constant stimulation all the time now.