I agree with the sentiment of dressing age appropriate. When I'm shopping with my adult daughter, there might be a few times I'll see something that I think is cute and she will give me the "no, mom, too young for you" look. And she's always right!
I don't have a problem with jeans fitting in one area and not another. My biggest issue are that all jeans in my size do not fit the same. I wish sizes were more standard between similar styles of jeans.