I actually used to measure my jaw width when I started my first cycle, until I realized I didn’t really care.
I’ve been told my face has "hardened" since I’ve started using, some of which is due to the low bodyfat the weeks before a show. Before the most recent one I was actually scared of my reflection, I looked all gaunt and sucked up.
I’ve noticed I never get carded anymore, and when I uploaded some pics of me to Facebook at age 29, before I used anything (I’m 33 now) I was asked to tag the pics because it didn’t recognize me.