I haven't worn any jeans since I was a teenager, and I'm in my late 30s now. My buttocks are rather large, high-riding and well-rounded, and there's at least 12 inches difference below my waist and my buttocks/hips. And I don't believe in taking jeans to the tailor.
I do like denim skirts, however, if they are tailored and don't look too Westerny (I can't stand Ralph Lauren's spring 2002 line). I used to have a good one from DKNY in the early 90s.