What is the spiritual meaning of shaking?

As you progress spiritually, you shake off the semblance of age—you lose the wrinkles that age and worldly cares have marked upon your countenance, together with other indications of the passage of years—you become younger in appearance while you grow older in knowledge and wisdom and spirituality. 

Nor do you lose those external indications of personality. 

To do that would make us all of a deadly uniformity, but we do return or advance, according to our age, when we pass into spirit towards what we have always known as ‘the prime of life.’