Final answer:
Advances in medical technology, knowledge about basic cleanliness, and creation of vaccines are possible explanations for longer life expectancy.
Step-by-step explanation:
One possible explanation for the longer life expectancy in the present age is advances in medical technology. Medical advancements have led to improved treatments, procedures, and medications that can help prevent and manage diseases, resulting in longer lifespans. Another possible explanation is the knowledge about basic cleanliness and hygiene practices that can help avoid diseases. This includes practices such as handwashing, proper sanitation, and access to clean water. Additionally, the creation and widespread use of vaccines have played a significant role in increasing life expectancy by preventing and minimizing the impact of infectious diseases.