Within 40 years, more than 800,000 Australians — twice as many as now — will be living with dementia, unless a cure is found, according to a new government-sponsored report. Dementia is the second leading cause of death in Australia. A new study by the Australian Institute of Health and Welfare, a government agency, has forecast that 1.1 million Australians will live with dementia by 2058, unless major new treatments are discovered. Dementia is a broad term for a number of conditions that impair the functions of the brain. In 2019, $2.1 billion was spent in Australia on residential and community-based services, and hospital care for dementia patients, two-thirds of whom are women. The release of the Australian Institute of Health and Welfare study has coincided with a new awareness campaign by Dementia Australia, a non-profit organization. Its chief executive, Maree McCabe, says exercise and a…