Murray Leinster 
Be Young Again! 

Be Young Again! is a science fiction short story written by Murray Leinster, an American author known for his significant contributions to the science fiction genre during the 20th century. "Be Young Again!" likely explores a speculative or futuristic scenario where advancements in science or technology provide the means for individuals to regain their youth or reverse the aging process. The story might introduce a protagonist who, through a scientific breakthrough or an innovative procedure, has the opportunity to become young again.