Don't Let That Old Man Become an Immortal!

During the day, I traveled to the world of cultivating immortals for ten thousand years, but restarted it ninety-nine times, and still could not cultivate immortality. Until the hundredth life, when he was already a hundred years old, he was suddenly able to cultivate immortality. So... "I restarted ninety-nine times. What's wrong with the speed of cultivating immortality?!"