As of our current understanding of physics and technology, it is highly unlikely that a human will be able to travel one light year in a single human lifespan.
The speed of light is approximately 299,792,458 meters per second (or about 186,282 miles per second). To travel one light year, which is the distance that light travels in one year, a spacecraft would need to travel about 9.46 trillion kilometers (or about 5.88 trillion miles).
At present, our fastest spacecraft, such as the Voyager 1 and 2 probes, are traveling at speeds of about 17 kilometers per second (or about 38,000 miles per hour). At this rate, it would take tens of thousands of years to reach even the closest star systems, which are just a few light years away.
The immense distances and the limitations imposed by our current propulsion technologies make it incredibly challenging for humans to travel such vast distances within a reasonable timeframe. Additionally, the energy requirements and technological hurdles associated with achieving speeds close to the speed of light, where relativistic effects like time dilation become significant, are currently beyond our capabilities.
However, it's worth noting that scientific and technological advancements are constantly evolving, and our understanding of the universe may change over time. It's difficult to predict what breakthroughs may occur in the future that could potentially revolutionize space travel. Concepts such as theoretical warp drives or other yet-undiscovered propulsion systems may emerge, but their feasibility and practicality are still uncertain.
For now, interstellar travel remains a significant challenge, and the focus is more on exploring and studying the universe through robotic missions, telescopes, and other remote sensing techniques.