There is no prevention to aging 8-/ matheusmoreira's recommendation sums it up: Nutritious diet and as much exercise as possible. Dementia is really the worst

There is no prevention to aging 8-/ matheusmoreira's recommendation sums it up: Nutritious diet and as much exercise as possible. Dementia is really the worst case scenario. A friend in Germany recently allowed her mother to stop eating, leading to death, in order to avoid further mental decline. Death is inevitable, the best hope is a healthy happy live until death. So let your parents do whatever they want, don't try to coral them into what seems best to you...