old比较级的形式是elder和older。old的最高级形式是eldest和oldest。old的意思是具体年龄，（多少）岁，年纪，老的，年纪大的，不年轻的，老年人。
old的例句He was abandoned by his father when he was three months old（他3个月大的时候被父亲遗弃）。He took a bunch of keys from the pocket of his old corduroy trousers（他从破旧的灯芯绒裤子口袋里掏出一串钥匙）。
