To me, success is happiness. Happiness to me means many things.
It means having someone to share my life with. It means companionship, camaraderie and affection.
It means feeling fulfilled with how I spend my days, engage with work and hobbies.
It means having enough financial security that I'm not stressing over every penny. It doesn't mean having everything I want; it means having everything I need and being able to sleep at night without worrying about money. I like knowing that I will have a home that is my safe haven from the world.
It means being happy with myself, not being ashamed or apologetic about who I am physically, intellectually and emotionally. This one is the hardest for me--probably always will be. Intellectually, I am very sure of myself but the other two....not so much.