One of my girlfriends in her mid 60s really enjoyed having sex with men in their 30s. It made her feel sexy and desirable and she never had any of the immaturity issues that you cite here with men of that age.
I also maintain that for a man you'll invariably have a better sexual experience with a middle-aged woman than you will with a young woman no matter how good looking. What the vast majority of men don't seem to understand is that there is no correlation between a woman's looks and what she is going to be like in bed.