Mick's biggest challenge in life is to think of his life as satisfactory and that it is worth living (i. e., he needs to get some satisfaction). according to psychosocial theory, mick is probably in the stage of life.

I believe the answer is: Late life

late life stage development tend to happen by the age of 65-79 years old. During this stage, people started to find very little value in materialistic things such as wealth and start to seek self-actualization and intimacy as their primary drive in life.

industry had made the u.s. the richest nation in the world at this time. the second industrial revolution caused growth in industry and transportation, which allowed increased trade between nations.