Travel essentials for senior travelers?

My parents are planning a trip this coming August, and my sister asked me to put together a travel essentials bag for them. So far, I've added things that worked for me like a bcozzy neck pillow, a pair of dr woof compression socks, and comfy slippers from northface

I want to add more stuff that senior travelers would find really useful or nice to have, but I'm kind of stuck. So I figured I'd ask here, if you're a senior traveler or have traveled with senior travelers before, what essentials or helpful items would you recommend me adding?