Ecclesiastes 3:11

He has made everything beautiful and appropriate in its time.  He has also planted eternity (a sense of divine purpose) in the human heart (a mysterious longing which nothing under the sun can satisfy, except God)-yet man cannot find out (comprehend, grasp) what God has done (His overall plan) from the beginning to the end.  

We all know this longing for connection to something, and many of us have searched many areas until we found Jesus.  Many unbelievers are still on this path, waiting for us to share our journey and witness the saving grace of Jesus to them.  No matter what age we are, we are still valuable to the unsaved as a witness to the goodness of God.