Separation anxiety is part of development for young children, but it may also occur in adults. Unfounded fear concerning one's self or family, difficulty sleeping, and depression are some of the symptoms. Treatment involves learning management strategies and therapy. Source: What is separation anxiety disorder in adults?
How the Midlife Crisis Came to Be Over the course of a few years in the 20th century, the midlife crisis went from an obscure psychological theory to a ubiquitous phenomenon. via How Modernity Invented the Midlife Crisis - The Atlantic