[Drugmachine]

I did not imply that you will overcome lactose intolerance by continuing to drink milk. Once you develop lactose intolerance there are some ways out of it. It is a given that the lactose digesting capability decreases as we age. So we can avoid drinking milk and substitute it with converted products.
1. Yogurt (called curd elsewhere)--here the bacteria used to make yogurt from milk converts lactose to lactic acid and converts the milk proteins into easily digestible products too. Our ancestors knew this. You can eat as much yogurt as you want without getting subjected to lactose intolerance.
2. The middle class families who buy their groceries in supermarkets (in India) can consume the special milk varieties such as soy milk or almond milk. Tofu (made from soymilk cheese) is free of lactose and a good source of protein. In addition there is another dairy milk called Lact-aid milk which has been treated with the enzyme lactase while preserving the taste and consistency of milk.
3. If you still want to drink milk there is one more way out of it. It is not yet commercially viable. What you can do is to subject milk to what is known as ultrafiltration whereby you would selectively remove lactose, salt, and water but not the fat or protein from the milk. The milk will get concentrated which you can redilute with water to its old concentration. Somebody can start this process in India and sell lactose-free milk if there will be market. No harm in trying it in a test-market.