According to science human beings lose all of their physical parts (cells) every 7 years. Despite the change we remain the same person mentally through the change every 7 years. We remain the same person mentally beyond those 7 years because we are more than just physical matter, we are body and soul.
How would a materialist argue that they are the same person after 7 years if their cells have completely changed?
If you think about this, you could pose the question that if someone were to go to jail, according to this view, they could argue that after 7 years they are a different person and would force to be released, especially in our post-modern/post-truth era.