On Weighing Bone and Weighing 4.7

The last sentence means that there will be "good luck" at the age of 28, 90 and 30. When you haven't arrived, you think everything is fine and the hard days are over. The second half of the sentence means that when "good fortune" comes, it is difficult and painful! Things will not get better until the age of 36 to 40, and good luck will follow.