Growing old is a fact of life. But thanks to improved health care and innovative technology, more of us are living longer and healthier lives. However, ageing isn't always easy. That's because your body and mind decline as you get older, and become more vulnerable to various diseases such as diabetes , dementia and some cancers. In our new study , we followed more than 12,000 older Australians to find out if staying socially and mentally active could help people stay physically fit in older age.