God then said he will reduce the age of man to down to 120 years in Genesis 6:3
Anyway since AI is the thing and quite useful. What are people in the modern world suggesting?
There is no consensus on a fixed maximum human lifespan, with estimates ranging from 115 to 150 years based on current biological limits, while theoretical models suggest ages up to 1,000 years if aging is medically cured.

The verified oldest person in history was Jeanne Calment, who lived to 122 years and 164 days. Current scientific debate centers on whether this represents a hard biological cap or simply a statistical plateau due to limited supercentenarian data.
Biological Limit Estimates: Recent studies using computer models and resilience metrics suggest a natural hard limit between 120 and 150 years, as the body loses the ability to recover from physiological stressors.
Demographic Predictions: Statistical models from the University of Washington estimate a 99% probability that someone will reach 124 years and a 13% probability of reaching 130 years by 2100.
Contrasting Views: Some researchers argue there is no fixed upper limit, citing late-life mortality plateaus in data, while others maintain a cap around 115–125 years due to intrinsic bodily decay.
I think this is the one shown below for pood to poo poo.
Theoretical Potential: Geneticists propose that if cellular aging were "cured," average human lifespan could exceed 1,000 years, with maximum lifespans potentially reaching 20,000 years.
Didn't God of the bible reduce the life span of humans? Calm down, please note: the above is not my argument.. however... non of the above is from the religious perspective of the bible.