batty old man

Translations
чокнутый старик
The kids in the neighborhood think the batty old man lives in the haunted house.
Дети в районе думают, что чокнутый старик живет в доме с привидениями.
Definitions
A batty old man refers to an elderly man who is perceived as eccentric, crazy, or silly, often due to unusual behavior or quirky ideas.