Great advice...one I needed as I'm months away from 50 and yes, I too would have loved to look smoking hot and I'm easily one of the highest I've ever been.
I've resorted to embracing simplicity - movement and yes, returning to cleaner eating. I've always recognized it truly just boils down to what we put in our mouth - and I've always wanted to blame the exercise. But your 80/20 rule is spot on facts.
Congrats and keep up the awesome healthy and smoking hot lifestyle! You go LIsa!!!!