I meant cuz is used for someone of the speaker's own age and not for a person of the speaker's parents age.

ie ants/Uncles are your parents siblings and cousins are ant/uncle's children so your own age.

But yes I agree boomers don't use it in any case.

I see what you're saying, ha ha. And you're right — it's people addressing those of the same age range. I didn't realize uncle and auntie were used for older strangers.