To regain one's youth; to become young again; to reverse the aging process.
长期坚持锻炼和保持乐观的心态，仿佛让他却老还童，精神焕发
Long-term exercise and maintaining an optimistic mindset seemed to make him regain his youth, full of vigor.
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To regain one's youth; to become young again; to reverse the aging process.