How to lose weight fast. I am 45 years and weighing 74 kgs . I want to lose 22 kgs . Kindly advise how can I do this with what kind of diet and exercise . I am a vegetarian.

There is NO safe way to loose THAT amount of weight quickly.
After all it took many years to put it on.

The only realistic method is decrease of calorific intake and increase in aerobic activity.
(Less food, more exercise)