senile

adj.老年的,高龄的,衰老的

衰老的；老年痴呆的

形容词

1、My grandmother is starting to show signs of senile behavior.
我的奶奶开始展示老年痴呆的行为迹象。

2、He often tells senile jokes that no one finds funny anymore.
他经常讲一些老掉牙的笑话，没人觉得好笑了。