In Plato's Utopia, anyone who wanted to begin to study philosophy had to have turned 40. It is located in the hidden recessed deep within the mind of God. No, it is quite attainable. Wisdom is not an art, a science, or a technique. Wisdom can never be found as an answer to a problem.
Wisdom is found only by entering into mystery.
That is why all of our information and knowledge and experience and philosophy only succeed in replacing one problem with another. And if we spend our whole lives merely solving problems, processing data, and managing information we'll miss the whole point of living. Like the Wise Men coming to Bethlehem from the East you must go on pilgrimage, make a journey, get off the dime, move, get out of the status quo, go beyond information, knowledge, experience, data, and even Philosophy. And even more like the Wise Men, you must go home by a different route. For Wisdom is a Person.