Maintain Your Brain (MYB) aims to: 1. In the short term develop an all new MYB eHealth platform that delivers multimodal, customised and sequential dementia risk factor reduction and lifestyle modification interventions over the internet. 2. In the medium term determine the efficacy of MYB eHealth platform to reduce the rate of cognitive decline in non-demented community dwelling persons aged 55-77 years. 3. In the long term determine the efficacy of MYB eHealth platform to delay the onset of dementia. 4. Examine the impact on reduction in risk factors, improvement in specific module targets (nutrition, physical activity, depression, individual cognitive domains) and cost effectiveness.