According to the essay, what is the main role of telomeres in the aging process?
They produce antioxidants that protect cells from damage.
They get shorter each time a cell divides, and when too short, the cell can no longer divide.
They are a type of stem cell that can repair damaged tissues.
They are directly lengthened by drugs like rapamycin and metformin.
Based on the passage, which of these is NOT mentioned as a lifestyle factor that can affect aging?
Eating healthy foods
Exercising regularly
Getting a specific number of hours of sleep
Reducing stress
The essay discusses several scientific approaches to aging. Which of the following is specifically named as a medicine being tested to extend lifespan?
Antibiotics
Metformin
Vitamins
Hormone therapy
What is the primary goal of aging research, as described in the essay?
To stop the aging process completely.
To allow people to live longer, but not necessarily healthier.
To help people live longer and enjoy more years of good health.
To focus only on reversing gray hair and wrinkled skin.
Which statement best summarizes the overall message of the essay?
Aging is a fixed and unchangeable process that science cannot alter.
While aging is natural, recent scientific progress is providing ways to improve health and quality of life in old age.
The only proven way to live longer is through a strict diet and exercise regimen.
Most aging research has focused on cosmetics to make people look younger.