Happy people are the most attractive - no matter their age, weight, or 'objective' appearance.
I can't find the exact quote I was looking for regarding happiness (I swear it was something in a science blog, but now I can't find it). In searching for that quote, I ran across a page full of ideas as to how to increase our happiness.
The most important thing I read in that quote was this:
"Are you happy? If not, why not? List some reasons. I challenge you to consider each and then realize that it’s not the circumstances themselves that have “made” you unhappy, but rather your reaction to them. Just the fact that you are not exercising your ability to choose to rise above the circumstances is plenty reason to be unhappy! You’ve made yourself out to be a passive victim. Rise above those thoughts!"
The whole page is here, and is filled with all kind of good ideas: