I work in hospice, so I'm in the homes of many, many elderly people. While it's not just the elderly, some people have balance, strength, endurance issues, or injuries that make standing and bathing risky. Falls are bad, falls when naked, wet, and onto hard surfaces are worse. You can purchase specialized medical equipment meant for shower use, but I can see someone using an inexpensive plastic stool as an alternative.
I work in hospice, so I'm in the homes of many, many elderly people. While it's not just the elderly, some people have balance, strength, endurance issues, or injuries that make standing and bathing risky. Falls are bad, falls when naked, wet, and onto hard surfaces are worse. You can purchase specialized medical equipment meant for shower use, but I can see someone using an inexpensive plastic stool as an alternative.