OSLO (Reuters) - Household robots may help human carers look after the growing number of elderly Norwegians in years to come, enabling them to live longer and more comfortably in their own homes, a project leader told Reuters on Thursday.Norway faces a growing shortage of health care staff over the next 5-10 years, and 2020 will be a crunch point when large numbers of post-World War 2 “baby boomers” leave the workforce. Two employee groups have teamed up to see how robots and other hi-tech gadgets can be developed to help care for them.