老当益壮该怎么翻成英文？

老当益壮 [词典] old but vigorous; become more vigorous [energetic] with age; gain vigour with age;have a green old age; [电影] Wrestling Ernest Hemingway; [例句]喔，他可真是个老当益壮的人，永远充满活力呢。Oh, he's a real spring chicken, always full of energy.