If your grandmother and great grandmother lived on farms, I guarantee they lifted far, far, heavier items than eggs or a dish of water. They probably had wringer washing machines, hung clothes out to dry on a line, had to clean out sheds and chicken coops, tended large vegetable gardens, shovelled snow to get to the barn in winter... 
My mother had severe osteoporosis. I lift weights because I don't want to break an ankle just standing up to get out of a chair, as she did in her 60s. I'm female and approaching 60 and so far have the bone density of a 30 year old, thanks to heavy weight training.