5'6" 151# & bought size 10 Reg & I am 51 years old.  I love these pants.  I haven't washed them yet but am optimistic.  I bought 2 pairs based on all of the good reviews.  These were so darn comfy all day.  I wore them to work, then to my babysitting job then to the sofa at home.  They stretch when they need to stretch and they don't stay stretched out.  These are kind of amazing.  The pants are a tad long so occasionally under my heel but I would rather that than too short.  Yes, and the butt look good; no panty lines and on the flip side no camel toe.  I will buy more colors eventually.