The life span of the last person on Earth would depend on a variety of factors. Here are a few considerations:
- Skills and Knowledge: If the person has a good understanding of survival skills, such as finding and purifying water, hunting and gathering, farming, first aid, and basic engineering, they would stand a better chance of surviving for an extended period.
- Health and Age: The individual’s health status and age would also be critical factors. A younger, healthier person would have a better chance of surviving longer than an older, less healthy individual.
- Access to Resources: The availability of resources like food, clean water, medical supplies, shelter, and clothing would also play a significant role. The person could initially rely on canned food and bottled water, but these supplies would eventually run out, necessitating hunting, gathering, or farming for sustenance.
- Environment: The local climate and environmental conditions would also significantly influence the individual’s survival. Some places on Earth are much more conducive to human survival than others.
- Mental Health: The psychological challenges of being the last person on Earth could also be a major issue. Loneliness and the psychological strain of being the only human left could lead to mental health issues that could also affect the person’s survival.
So, it’s difficult to give a specific time frame for how long the last person on Earth could survive. Their survival would ultimately be determined by their ability to maintain their physical health, secure food and water, and cope with the psychological challenges of their situation.