Lǎorén suīrán niánjì dà le, shéncǎi yīrán bùjiǎndāngnián.
Though the old man is up in years, his spirit is no less than in his prime.
Tips
usage
Often paired into the chengyu 神采奕奕 ('glowing with spirit') or 神采飞扬 ('spirits soaring'). Describes the vitality you can read in someone's face and bearing - not raw appearance.