With aging adults, staying properly hydrated is extremely important, yet sometimes difficult to do. Older adults may be more susceptible to fluid and electrolyte imbalances. Their sense of thirst might diminish. And certain medications or medical conditions might make it more difficult to retain fluid.

With that in mind, here is an article on preventing dehydration in aging adults.
https://betterhealthwhileaging.net/qa-how-to-prevent-diagnose-treat-dehydration-aging-adults/