This is, of course, a matter of opinion.
In my opinion, success consists of getting for yourself the kind of life you want. This must be the kind of life you truly want -- one that will make you happy. For different people, success will be defined differently because different things make different people happy.
For me, happiness is having a happy family that gets to spend time together.
We have achieved success through education (having enough education to get a good job) and through some sacrifice (I no longer work full-time so that I can stay home with the kids).
But this will differ for different people.