Baths

I was thinking of putting another bathroom in extensions to mums house. (Upstairs) . I thought to myself when was the last time you had a bath? It must be at least 37 years. Use to wash my baby son . Does anybody have an opinion on why I should have one when from my view they are obsolete ? Old people have trouble getting in and out of them . Also I can remember slipping once and nearly killing myself. Waste of space and money I reckon.