Eyes

This is the reason that I am and have always been an eye person.  Think about it, skin sags and wrinkles, and can get spots and discolor, hair turns gray and can even fall out, teeth fall out and are replaced by fake teeth (unless you're extremely lucky) we may gain or lose weight, but in some form, we likely won't keep our younger figures, but eyes... they're ageless.  for the most part, when you look into someone's eyes, they're the same eyes you looked into when you first met them, when you first fell in love with them, years ago.