Based on our current understanding of physics, biology and chemistry, what is the chance of alien life being within a distance of earth that can be traveled within a human life time at speeds lower than the speed of light?
This is a question that is difficult to answer with any certainty. There are many unknown variables that would need to be considered in order to estimate the likelihood of alien life within a distance that can be traveled within a human lifetime at speeds lower than the speed of light.

First, we would need to consider the number of potentially habitable planets in the universe. While we have discovered many exoplanets in recent years, we are still unable to determine whether or not they are capable of supporting life. Additionally, we do not yet know how many potentially habitable planets exist beyond our current observational capabilities.

Second, we would need to consider the probability of life arising on a given planet. While we have a general understanding of the chemical and environmental conditions that are necessary for life as we know it to exist, we do not know how common these conditions are in the universe.

Third, we would need to consider the likelihood of intelligent life developing on a given planet. Even if life does exist elsewhere in the universe, it is unclear how often it evolves to a point of intelligence.

Finally, we would need to consider the technological capabilities of any potential alien civilizations. While we can currently travel at speeds slower than the speed of light, we do not know whether or not any potential alien civilizations have developed technology that would allow them to travel at much faster speeds.

Given these many unknown variables, it is difficult to estimate the likelihood of alien life being within a distance that can be traveled within a human lifetime at speeds lower than the speed of light. While it is certainly possible that such life exists, we simply do not have enough information to make an accurate prediction.
Aaaa too much text.. summarize your reply in bullet points