In his later life he became even more absent-minded.

他晚年变得愈加健忘了。

柯林斯高阶英语词典

He's very learned but rather absent minded.

他很有学问,可是好忘事.

《简明英汉词典》

The absent minded representative presented a present to me.

心不在焉的代表给我送了一份礼物.

期刊摘选