Middle adulthood is a stage of life between young adulthood and old age, usually from about 40 to 65 years old. It's characterized by stability in work and relationships, but also a time of reassessment and potential crisis.
Related terms
Mid-Life Crisis: A period of emotional turmoil in middle age characterized by a strong desire for change.
Empty Nest Syndrome: Feelings of sadness or loss when all children have left home and the parents are left alone.
Menopause/Andropause: The time in most women's lives when menstrual periods stop permanently (menopause), and the decrease in male hormones during middle-age (andropause).