As of our current scientific understanding, traveling backward in time, specifically to change or interact with events that have already occurred, is not known to be possible. The laws of physics, as we currently understand them, do not allow for such backward time travel.
While certain theories and thought experiments in physics, such as the concept of wormholes or hypothetical particles called tachyons, have been proposed as potential mechanisms for time travel, they remain highly speculative and are purely theoretical at this point. No experimental evidence or practical means to achieve backward time travel has been discovered.
Regarding the aging process, if backward time travel were possible, it could raise interesting questions about the effects on the aging of the human body. However, it is impossible to provide a definitive answer since the concept of time travel, particularly backward time travel, remains purely speculative at this stage.
It's worth noting that discussions about time travel often arise in the realms of science fiction, where authors explore imaginative possibilities that go beyond our current scientific understanding. While these ideas can be fascinating to consider, it's essential to differentiate between scientific theories and concepts and fictional narratives.