Increasing Human life expectancy?

It is possible to increase life expectancy by improved medical care.The secret of long life 100 years or more is slowing down the rate of decay of cell.One way tried by ancient people was reducing the number of breath per minute.Yogis use this method,when number breath is reduce less work for lungs etc.With one breath per hour,a person may be available to live 1000 years.In Himalayas there are yogis hundreds years old.The oldest Yogi is Mahavthar Baba who is more than 1950 years old.The person who live long take very little food.Per capita food consumption becomes less.Since capacity for reproduction will not increase,in proportion to age,the long run population growth will be zero or negative.The world will be full of old people ,production pattern will have to be changed.