Invincible! This person has lived for a billion years

Five of the world's wealthiest tycoons descended upon a poverty-stricken district simultaneously, astonishingly just to visit a 20-year-old young man. This young man was their master fifty years ago. Initially, these magnates only acquired some rudimentary knowledge from William Johnson, but that was enough to make them leaders in their respective fields. However, they were stunned by William's ageless visage when they saw him again, as they were unaware that William Johnson had lived for a billion years. He not only established different religions all over the world, but even Alexander the Great was once his student. Yet, after dispersing the tycoons fifty years ago, he chose a long slumber. But now, William Johnson has awakened...