>I heard that falls are lethal for the elderly.
falls are lethal in general. I personally know of a man who broke his back and neck (two separate occasions) with shower falls, the last fall leaving him quadriplegic, and a distant relative died from the same thing.
I don't care enough to go reference hunting but I remember at one point reading that taking a shower is one of the most dangerous singular and common things that anyone does on a daily basis.