3 sentences

1. 我又没得老年痴呆。

   wǒ yòu méi dé lǎo​nián chī​dāi.

   I don't have dementia.

   Source: OpenSubtitles

2. 这种新药旨在治疗早期老年痴呆。

   zhè zhǒng xīn yào zhǐ​zài zhì​liáo zǎo​qī lǎo​nián chī​dāi.

   This new drug is intended to treat early-stage Alzheimer's disease.

   Source: Dong Chinese Dictionary

3. 他被突如其来的消息吓得满脸痴呆。

   tā bèi tū​rú​qí​lái de xiāo​xi xià de mǎn liǎn chī​dāi.

   He was stunned senseless by the sudden news.

   Source: Dong Chinese Dictionary