Sum of Memories

Many people dream of being able to transfer into a younger body. But...
What makes me, me?
Am I the body that everyone recognises? Am I my personality? Am I a spirit, an empty life-force that becomes me through a unique experience of life? - Jonathan wakes up one morning, feeling better than he has done for months. How can it be that when he looks in the mirror, it is his son in the reflection?