Why did Swami Vivekananda die so young?

Swami  Vivekananda  did not  live long and left his physical body at the age of 39. Even though Swamiji suffered from many ailments such as diabetes and asthma. But on the day of passing he was actually in good health and in jovial mood during breakfast. So What caused him to die so young?
So behind the every transformation of soul, there is a greater spirituality hidden that we never notice. However luckily Swami revealed the truth  himself.

Nearly 6 years before his demise ,swami ji confined to his disciple swami Abhedanaanda that he wont live more than 5-6 years. WOW! how so accurate was he?  When questioned , he said  that his soul is getting bigger and bigger every day. His soul can hardly be contained in it and any day it can burst the cage of flesh and bone.
soul = pure consciousness.
So what swamiji meant is that his consciousness was expanding beyond the realms of ordinary consciousness to the domain of super consciousness that body was proving an inadequate container and would have to soon let it go.
If we look at the Vedanta ; consciousness exists separate from the body which means it is a form of energy  that can neither be created nor destroyed.

So according to the  Vedanta philosophy, any individual soul is a small  part of consciousness.

So whatever human experiences is a subset of the infinite range of consciousness as shown in figure. Beyond that human doesn't  experience any thing. It is similar to light where human can see only few out of full. eg. bee can  pick out many more colors than human soul.

 Vedanta tells us that different creatures experiences different  portion of it. eg: For an ant it has much lower consciousness than us. Ant has limited consciousness , many thing exists beyond it which ant is unaware. 

Now soul or consciousness of ant expands so that it became aware of  more things. So vedanta tells us that soul of ant will evolve to another body and brain where it  can have greater consciousness which might be cat. But ant does not jump directly to cat rather than there are  may be many small evolution steps in middle. In Hinduism  soul is said to traverse to 8.4 million  life forms before it attains to human birth. But human birth is not final step of evolution chain. Human consciousnesses might be superior to animals but it is still  restricted. In fact still beyond the realms of  ordinary human consciousness, lies a specific state of super consciousness where one's soul became so enlarged that it has became infinite. At last there is state where the soul has became one with the  infinite ocean of consciousness is known as universal consciousness or GOD. In Hinduism it is called samadi which means that freedom or liberation from evolutionary from cyle of death and birth. For the ultimate state of super consciousness the samadi the soul is set free. Its infinite consciousness can be no longer be confined to any finite body.