If you keep you beardie well hydrated he will live longer but you dont need to bathe daily to do that just make sure he is well hydrated and bathed regularly.
I think you can tell by their skin. If they are dehydrated it will be wrinkly? Not sure about that just bathe you little one a few times a week and they should be okay!
Yes most evident sign is the wrinkly skin on their sides, but the best way to tell in the consistancy of the urate. For instance if it is to firm they aren't getting enough hydration an if they are hard this is bad definitely not enough hydration. Every living thing requires hydration in order to live so "yes" is my answer to "live longer?"
Mirage came out of brumation on April 26. He was doing great. On May 2 he started acting funny. We just redid his tank, and he keeps going into one of his hides. He just lays there. He shows no intrest in food. HELP!