The strength of gravity on a planet significantly affects the physiological and biological processes of organisms, including humans. If we consider a planet with a gravity 100 times that of Earth's, the impact on human life expectancy would be substantial.
Higher gravity would place more stress on the human body, especially the skeletal and cardiovascular systems. It would make movement more challenging, as it would require more force to overcome the increased gravitational pull. Additionally, the heart would have to work harder to pump blood against gravity, potentially leading to cardiovascular issues.
Increased gravity could also affect bone density. Bones would need to be stronger to support the increased weight, but over time, they might become more brittle and prone to fractures.
Furthermore, higher gravity would likely impact the growth and development of organisms, possibly leading to shorter heights for humans due to the additional strain on bones and joints during growth.
Considering these factors, it is reasonable to assume that human life expectancy would be significantly shorter on a planet with 100 times Earth's gravity. While it is challenging to estimate an exact number, it is conceivable that life expectancy could be reduced to a fraction of what it is on Earth. The stress and strain on the human body would likely result in various health issues and a reduced average lifespan for humans on such a planet.