Noun:

1. an oldster in his dotage; someone whose age has impaired his intellect

Dotan.倒塔(=Defense of the Ancients；一款魔兽游戏)dotn.少量；小圆点；小东西v.点缀；作小点记号[计算机] 点.dot-character[计] 点式字符印刷dot information点信息dot matrix LEDs发光二极管矩阵dot matrix size点阵精度dot interlacing隔行扫描dot-frequency短点频率dot cloud datum点云数据dot addressable点可寻址的dotted cataract点状(白)内障, 蓝色点状内障dot-dash mode点划法

1. You are a real dotard to have forgotten it so easily.
   这么容易就忘了，真是一个老糊涂。