Start on the ayurvedic process of Panchakarma from age 40, for two to three weeks every year, to detox, rejuvenate and prevent chronic diseases.
Develop healthy eating habits: Plenty of fruits and vegetables, water, fruit juices along with occasional fasts. Non-vegetarians should try to go light on meat.
Mindfulness is the key to good health. Take up yoga and meditation to fight stress. They are also the best antiageing tools.