Re: "Recently my older iPad stopped playing sound through the USB C port to wired EarPods. The port works for charging the iPad but not the wired EarPods".
Seems your post has gone unanswered so far. Am no expert in this area, yet a reply can provide more opportunity for others to share their knowledge.
Also, we don't have much info. to go on
.
Eg: Wondering which iPad model, and EarPods model you have,
If needed: See how to: Identify your iPad model - Apple Support
____________________________________________________________________
Re: "I had an older set of with a 3.5 jack and used an adapter for the USB C and that doesn't work nor does the USB C wired EarPods. When I plug the cable in, the sound continues coming from the iPad speaker".
Wondering which adapter you have tried without success. Apple's linked article below may be helpful, as it provides tips for a few different combinations.
See how to: Use Apple wired headphones - Apple Support