This is my brother's theory on why they never talk about going to the bathroom in Star Wars.
A long time ago, in the same galaxy that Star Wars takes place in a Jedi was on a mission to stop a smuggler. He was just about to catch the criminal when nature called. The food he had eaten a few hours before had reached the other end. Thankfully he was able to make it to the toilet before he pooped his pants. That break had led to him being captured. Ever since then Jedi only poop once a year. It takes all their power to store it for one big moment, where they clog their toilet. And that is my brother's theory on Jedi and toilets.
P.S. My brother is older than you think... a lot older