An elderly couple who never tire of looking at each other — truly enviable.
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From Li Bai's (李白) Tang-dynasty poem 《独坐敬亭山》 (Sitting Alone on Mount Jingting). Full couplet: 『相看两不厌，只有敬亭山』— 'the one thing I never tire of looking at, and that never tires of me, is Mount Jingting.' After all his birds have flown and clouds have drifted off, only the mountain keeps him company.
usage
Used both for human relationships (lovers, old friends, long-married couples) and for landscapes or objects of deep attachment. The two 'both' (两) are the viewer and the viewed — each inexhaustible to the other.
