These olives get better with age, but the world will never know how good they can get since they don't last very long. I prepare all my olives this way. I mix them all up in a large jar and just pick out the ones I want for a particular recipe or just use a medley. They are stored in the refrigerator and the olive oil may harden; this does not affect flavor or quality. If you prefer your olives less oily, run under running water to rinse.