Wisdom of Thankfullness

I have heard it said that the worst part about being old is remembering being young; the helplessness of knowing you cannot go back. Yet, I wonder when we reach the distant shore beyond the world as we have known it, if we will find ourselves returned and in the flower of life, men and women of, perhaps 30 years. How would it be to again be full of life but to have also the knowledge of the aged? To know the wisdom of thankfulness when yearning for what was is transformed into the joy for what is. Few in their youth know such wisdom.