The Vastness of Time

Take enough Vitamin C, they tell me, And you can end up living forever. However, leaving aside forever, You can, they say, live a very long time. Taoist 'immortals' ate cinnabar, Many searched for the fountain of youth, Many prayers to heaven beg for more years, Such endeavors bring only dust and tears. Where the soaring rocky mountains now stand Grand ocean waves once shifted shore side sand, Where desert heat now endlessly shimmers Once a green fern forest quivered with life. The mayfly lives but a single season, Can you tell me the seasons of a star?