プログレッシブ和英中辞典(第4版)の解説
わかがえり【若返り】
restoration of youth；《文》 rejuvenation
若返りの薬
a rejuvenating drug／a rejuvenator
会社の幹部の若返りはよいことだ
It's a good thing to 「move some young men into leadership positions in the firm [infuse new blood into the management of the company].