Definitions of rejuvenate:

• verb:   make younger or more youthful

  Example: "The contact with his grandchildren rejuvenated him"

• verb:   develop youthful topographical features

  Example: "The land rejuvenated"

• verb:   cause (a stream or river) to erode, as by an uplift of the land
• verb:   become young again

  Example: "The old man rejuvenated when he became a grandfather"

• verb:   return to life; get or give new life or energy