I'm not quite as old and crusty as Oddball (thank goodness) but I did turn forty last year....
I don't know why exactly, but fiction just doesn't appeal to me anymore. I read a lot of it as a kid/teen and a fair bit in college (assigned literature) but I just don't read it any more. I guess it's just that there is so much information out there that I can't waste my time reading somebody else's imagination put in print.