老当益壮

lǎodāngyìzhuàng

(1) [hale and hearty in old age; be old but vigorous]∶主要指老年人继续保持旺盛的斗志

丈夫为志, 穷当益坚, 老当益壮。 --《后汉书·马援传》

(2) [florid old; be old in age but buoyant in spirit; there's many a good tune played on an old fiddle]∶年纪虽老, 仍健康和充满活力

老当益壮, 不甘落后