What? How old is that peripheral that jacks in?!

I have used all of the following this year:

• Circumaural headphones: new (this year)
• IEM headphones: 2019? 2020?
• Aux ports in various rental and relatives' cars: various
• Professional audio console to play a file for a room full of people because I was the only one with a phone with a headphone jack: doesn't matter - it will have analog inputs whether it's brand new or 50 years old
• Tape adapter in an old van: probably as old as the van (2002)

You use an ⅛-¼" adaptor, don’t you.

I believe that was involved for one of the above items.