Final answer:
Age alone isn't a barrier to longevity or physical performance, as demonstrated by Fauja Singh who took up marathon running at 89 and competed until he was 102, attributing his health to lifestyle choices like a vegetarian diet, no smoking or drinking, and positive thinking.
Step-by-step explanation:
The question seems to be asking about the longevity and physical performance of an individual based on their age. Focusing on the example of Fauja Singh who was 39 years old and later became a marathon runner at 89, it is clear that age alone is not a definitive barrier to physical endurance or longevity. Singh's continuation in competitive running until the age of 102 and holding world records for his age group suggests that being in one's 60s wouldn't necessarily prevent someone from lasting long in a physically demanding task, provided they have a healthy lifestyle.
Singh's lifestyle choices, such as never smoking or drinking alcohol, vegetarian diet, avoiding fried foods, going to bed early, and maintaining a positive outlook, played a pivotal role in his remarkable physical abilities during his later years.