The gist of this prophecy is that, when the upcoming revival and end times harvest breaks out, it will be accompanied by great volumes of supernatural healing.  One of the things that will accompany it will be supernatural youth.  Yes, believers will become young again, as best I understand it.  But how exactly that'll work out, I don't know.  The only thing I know is that many will be made youthful again.  Believers everywhere will be healed of ALL their ailments, directly by God, and nobody will be sick, feeble, infirmed, etc.  All will be 100% healthy.