To recover one's youth; to regain youthful vigor and vitality; to become young again.
这位老人虽然年过八旬，但每天坚持锻炼，看起来精神矍铄，仿佛反老成童一般。
Although this elder is over eighty, he insists on exercising daily and looks exceptionally vigorous, as if he has regained his youthful vitality.
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