I think the most important feature for someone to fall in love with is the other persons face. I don’t say this because of beauty, but because of the way her smile makes you smile, the way her eyes sparkle just for you. That special sparkle that lets you into, them, as a person. Or even as simple as the way their nose crinkles or the lines in their jaw.
In a world where love is defined as a multitude of cultural differences, choices in life, eating habits, and stress levels, the face never changes. The face never lies.
In 100 years if you can picture staring at that person next to you and seeing their beauty through your eyes, you have found love.
Of course, the challenge is finding that beauty you need with a person you are compatible with. But life will change us every day. I am not the same person I was when I was young, nor am I the same person I was yesterday, and while some may consider a marriage in which every ten years you re-evaluate if you fit, I see a mixture.
Someone’s appearance isn’t everything. You can gain and lose weight as quickly as the blink of an eye. Your can cut or grow your hair. Your style fits you when you need it. However, there is an essence in the face, that shows the way a person is. You can see the core of someone’s morals through their face. I have recently draw upon the idea that some of the most successful relationships I have ever seen were when the couple had similar physical traits, mostly in their faces or expressions.
It is kind of like an owner and their dog, just not in a weird beastial way 
Perhaps it is the idea that behind all of our self doubt and self consciousness, we are beautiful to ourselves. If we didn’t have some semblance of this, doubts and all, I don’t think we would make it from day to day. So perhaps in a very basic sort of way, we see that one thing we have no control over; the beauty in ourselves through our own eyes and we find that in our perfect match. And perhaps that same thing that controls that part of our subconscious is a part of what makes our minds run the way they do and hard codes us with the choices we will make, and the paths we decide to travel. If we go after those who grab us not for the makeup and eyeliner, but the pure, simplistic, animalistic, unabated beauty, we may find love for the rest of our lives.
It is hard to say beauty is within, when our first impressions are usually without. So why not go with that first gut reaction, because if you make sacrifices to your own feelings, you may end up in love with the idea of love itself and not the person next to you.
Who knows, maybe the simple way you can stare into their eyes, is actually a mental pheromone which shows you a similar path you are both going to journey down, a compatibility unseen until you jump in. That simple sparkle may act as a light to guide the way, for both of you.
