Beauty is like a fresh sandwhich that uses fresh meat, bread...etc! It looks wonderful until you leave it out for a week straight. lol
Beauty fade away over time. We all get wrinkles, grey hair, more weight...etc. To me beauty has never played a roll in who I choose. Although the world makes you think it matters when it does not.
I've been with women who think they are the most hideous people ever and I thought they were beautiful (inside and out). Problem is if you worry about not looking good enough it will make a relatinoship hard. The one girl I was with, no matter how much I stared into her eyes and said she was beautiful, she would just put her self down more. It was stressful and eventually she left me because she really thought she was to ugly to be with. The world won with her. :-/
So don't worry about beauty. It goes away over time. But beauty in the heart does not!