To live the last 5 years of your life from age 5-10, instead of from whatever to whatever(we're assuming you're going to be old as shit)
The one catch is, you die on your 10th birthday, and when you relive from age 5-10, you have no recollection of your prior life.
So Newschoolers, would you do it? Die as an old person? Or as a child?