Without fail, many of the older women I have been around (in the 30's range) are much more bitter, much more "procedural" I guess I would put it, and lack the natural coquettishness that makes being around young women so much fun.
Mature is not an attractive attribute for women, they are best when they are playful, joyful, energetic, etc.
Men fit the serious, stoic mold much more naturally, and better. Men and women's personalities need to have contrast in order to match most harmoniously.
Making a girl smile, laugh builds a guys ego like no other. It reveals her beauty in its purest form.