Everyone is different. Unless I go out every day, I don't shower every day. Every other day suits me fine, of course on the days I don't shower, I will take a sponge bath. As we get older, most of us will run into having drier skin than when we were younger, and all of that extra water tends to dry us out more. Below is part of one article I googled online.
There’s no one-size-fits-all answer to this question. Many doctors say a daily shower is fine for most people. (More than that could start to
cause skin problems.)
But for many people, two to three times a week is enough and may be even better to maintain good health. It depends in part on your lifestyle. Someone who spends hours in the hot sun working in the yard or running or biking, will likely need to bathe more often than someone who’s cool and indoors.