something never gets old, means you like it very much and you never get tired of it. 中文意思是你很喜欢某事物，从不觉得厌烦，也相当于中文里的“百听不厌、百看不厌”等；例如：I like Adele a lot. Her music never gets old. 我很喜欢阿黛尔，她的音乐真是百听不厌。