The term "Quarterlife" refers to the period between adolescence and full-fledged adulthood, typically ranging from age 18 to 25. It is a transitional phase where individuals are navigating through various life stages such as graduation, entering the workforce, establishing independence, developing personal relationships, and finding their place in the world. The term was coined by author Marshall Glickman to describe this unique stage of life that falls between the traditional milestones of high school and college, and marriage and career.