Why do old people always chew even when nothing is in their mouth? Like they are chewing an invisible gum?😮

Trouble with their dentures?

Neurological symptom. Happens with Parkinson's disease for instance.

You will come to know after 50 years.

Yes every single older person does that🙄

Drugs

Funnier is when their mouths are always open. It’s a look of horror. Like they’re so old they can feel Earth’s rotation pulling at them and it’s freaking them out.

It’s called grinding your teeth
I do itnsometimes

Dentures.
Apparently people with dentures do this.

People with Dentures do that

Butterscotch discs maybe?

Because they're chewing on coca leaves. The secret to being old is drugs.

As not [b]all[/b] old people do, you’d only receive an accurate reply from those you observe doing it.