Uncle’s & Aunt’s
My youngest aunt is only nine years older than I am. I have always called her “Aunt_____.”* That went for my great-aunts and uncles as well.
Likewise, my kids call their aunts and uncles such (although all their aunts/uncles were already adults or near-adults by the time they were born).
The Wolf
* And, yes, we weren’t frum at the time.