I have about 7 pairs of chinos, 3 of which are in a "jean" cut that i really like. That is they are 5 pocket/front pocket cut. I never associated chinos with being mature but then again I went to a prep school and that was just about all I wore through out high school. I also recently cleaned out my closet and got rid of some pre-styleforum chinos i had. They were so boxy and baggy they might as well have been parachute pants.