Evaluate the integral. 
Definitions:
Primary Aging
Aging that involves universal and irreversible changes that, due to genetic programming, occur as people get older.
Functional Age
An individual's age based on physical, emotional, and cognitive capabilities, rather than chronological years.
Major Illnesses
Serious health conditions that have a substantial impact on a person’s life, often requiring long-term management or treatment.
Young Old
The term "young old" refers to the age group often considered early old age, typically encompassing individuals aged 65 to 74 years, who are often more active and healthy than those in later old age.
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