Double check? or Trust issue?

one day...
En.Abu: How old are you, Ali?
Ali :I'm 23 years old.
En.Abu: Ok.

Then En. Abu went to Karim's place,
En.Abu: karim, How old is Ali?
Karim: He's 23 years old.
En.Abu: Ok.

Unfortunately we still need to deal with people like En.Abu in our organization. what to do...